T. H. Wooldridge, “Estuarine Zooplankton Community Structure and Dynamics,” In: B. R. Allanson and D. Baird, Eds., Estuaries of South Africa, Cambridge University Press, Cambridge, 1999, pp. 91-100.
 B. R. Allanson and G. H. L. Read, “Further Comment on the Response of Eastern Cape Province Estuaries to Variable Freshwater Inflows,” South African Journal of Aquatic Science, Vol. 21, 1995, pp. 56-70.
 N. Grange and B. R. Allanson, “The Influence of Freshwater Inflow on the Nature, Amount and Distribution of Seston in Estuaries of the Eastern Cape, South Africa,” Estuarine, Coastal and Shelf Science, Vol. 40, No. 4, 1995, pp. 403-420. doi:10.1006/ecss.1995.0028
 H. L. Jerling and T. H. Wooldridge, “Plankton Distribution and Abundance in the Sundays River Estuary, South Africa, with Comments on Potential Feeding Interactions,” South African Journal of Marine Science, Vol. 15, 1995, pp. 169-184. doi:10.2989/02577619509504842
 P. D. Vorwerk, “A Preliminary Examination of Selected Biological Links between four Eastern Cape Estuaries and the Inshore Marine Environment,” Ph.D. Thesis, Rhodes University, Grahamstown, 2006, pp. 1-268.
 A. K. Whitfield and M. N. Bruton, “Some Biological Implications of Reduced Fresh Water Inflow into Eastern Cape Estuaries: A Preliminary Assessment,” South African Journal of Science, Vol. 85, 1989, pp. 691-694.
 L. D. Ter, E. R. Morshuizen and A. K. Whitfield, “The Distribution of Littoral Fish Associated with Eelgrass Zostera capensis in the Kariega Estuary, a Southern African System with a Reversed Salinity Gradient,” South African Journal of Marine Science, Vol. 14, 1994, pp. 95-105. doi:10.2989/025776194784287049
 A. K. Whitfield and T. H. Wooldridge, “Changes in Freshwater Supplies to Southern African Estuaries: Some Theoretical and Practical Considerations,” In: K. R. Dyer and R. J. Orth, Eds., Changes in Fluxes in Estuaries: Implications from Science to Management, Olsen & Olsen, Fredensborg, 1994, pp. 41-50.
 L. D. Ter Morshuizen, A. K. Whitfield and A. W. Paterson, “Influence of Freshwater Flow Regime on Fish Assemblages in the Great Fish River and Estuary,” South African Journal of Aquatic Science, Vol. 22, 1996, pp. 52-61.
 A. K. Whitfield and A. W. Paterson, “Distribution Patterns of Fishes in a Freshwater Deprived Eastern Cape Estuary, with Particular Emphasis on the Geographical Headwater Region,” Water SA, Vol. 29, No. 1, 2003, pp. 61-67.
 E. E. Heyns and P. W. Froneman, “Spatial and Temporal Patterns in the Hyperbenthic Community Structure in Southern African Permanently Open Estuary,” Estuarine, Coastal and Shelf Science, Vol. 88, 2010, pp. 105-115.
 P. D. Vorwerk, A. W. Paterson, P. W. Froneman and A. K. Whitfield, “Increased Abundance of Two Important Sport Fishery Species Following Renewed River Flow into a Freshwater Deprived South African Estuary,” Fisheries Management and Ecology, Vol. 16, No. 5, 2009, pp. 420-423. doi:10.1111/j.1365-2400.2009.00687.x
 P. D. Vorwerk, P. W. Froneman, A. W. Paterson, N. A. Strydom and A. K. Whitfield, “Biological Responses to a Resumption in River Flow in a Freshwater Deprived, Permanently Open Southern African Estuary,” Water SA, Vol. 34, No. 5, 2008, pp. 597-604.
 P. D. Vorwerk, P. W. Froneman and A. W. Paterson, “Revival of the Critically Endangered River Pipefish, Syngnathus watermeyeri, in Eastern Cape Estuaries,” South African Journal of Science, Vol. 103, 2007, pp. 193-195.
 N. Grange, A. K. Whitfield, C. J. De Villiers and B. R. Allanson, “The Response of Two South African East Coast Estuaries to Altered River Flow Regimes,” Aquatic Conservation: Marine and Freshwater Ecosystems, Vol. 10, No. 3, 2000, pp. 155-177. doi:10.1002/1099-0755(200005/06)10:3<155::AID-AQC406>3.0.CO;2-Z
 N. A. Strydom, A. K. Whitfield, A. W. Paterson, N. A. Strydom, A. K. Whitfield and A. W. Paterson, “Influence of Altered Freshwater Flow Regimes on Abundance of Larval and Juvenile Gilchristella aestuaria (Pisces: Clupeidae) in the Upper Reaches of Two South African Estuaries,” Marine and Freshwater Research, Vol. 69, 2002, pp. 178-189.
 P. W. Froneman, “Response of the Plankton to Three Different Hydrological Phases of the Temporarily Open/ Closed Kasouga Estuary, South Africa,” Estuarine, Coastal and Shelf Science, Vol. 55, 2002, pp. 535-546. doi:10.1006/ecss.2001.0921
 A. W. Paterson and A. K. Whitfield, “A Stable Carbon Isotope Study of the Food-Web in a Freshwater-Deprived South African Estuary, with Particular Emphasis on the Ichthyofauna,” Estuarine, Coastal and Shelf Science, Vol. 45, 1997, pp. 705-715. doi:10.1006/ecss.1997.0243
 P. D. Vorwerk and P. W. Froneman, “The Importance of Estuarine Derived Carbon for the Near Shore Marine Environment: Studies on Contrasting Southern African Estuaries,” African Journal of Aquatic Science, Vol. 34, 2009, pp. 67-77. doi:10.2989/AJAS.2009.34.2.4.891