J. W. Jamieson, B. A. Wing, J. Farquhar and M. D. Hannington, “Neoarchaean Seawater Sulphate Concentrations from Sulphur Isotopes in Massive Sulphide Ore,” Nature Geosciene, Vol. 6, No. 1, 2013, pp. 61-64.
 R. J. Newton, E. L. Pevitt, P. B. Wignall and S. H. Bottrell, “Large Shifts in the Isotopic Composition of Seawater Sulphate across the Permo-Triassic Boundary in Northern Italy,” Earth and Planetary Science Letters, Vol. 218, No. 3-4, 2004, pp. 331-345. doi:10.1016/S0012-821X(03)00676-9
 A. L. Norman, W. Belzer and L. Barrie, “Insights into the Biogenic Contribution to Total Sulphate in Aerosol and Precipitation in the Fraser Valley Afforded by Isotopes of Sulphur and Oxygen,” Journal of Geophysical Research-Atmospheres, Vol. 109, No. D5, 2004. doi:10.1029/2002JD003072
 M. C. Eimers and P. J. Dillon, “Climate Effects on Sulphate Flux from Forested Catchments in South-Central Ontario,” Biogeochemistry, Vol. 61, No. 3, 2002 pp. 337- 355. doi:10.1023/A:1020261913618
 E. Beaulieu, Y. Godderis, D. Labat, C. Roelandt, D. Calmels and J. Gaillardet, “Modeling of Water-Rock Interaction in the Mackenzie Basin; Competition between Sulfuric and Carbonic Acids,” Elsevier, Amsterdam.
 L.-M. Hang, G.-L. Zhang and J.-L. Yang, “Weathering and Soil Formation Rates Based on Geo Chemical Mass Balance in a Small Forested Watersheds under Acid Precipitation in Subtropical China Catena,” CATENA, Vol. 105, 2013, pp. 11-20.
 M. Edraki, S. D. Golding, K. A. Baublys and M. G. Lawrence, “Hydrochemistry, Mineralogy and Sulfur Isotope Geochemistry of Acid Mine Drainage at the Mt. Morgan Mine Environment, Queensland, Australia,” Pergamon Oxford, New York and Beijing, International, GeoRef.
 M. Aikawa, T. Hiraki, Y. Komai, U. Satoshi and N. Tokuch, “A Case Study on Input-Output of Sulfur in a Catchment Area in Japan,” Journal of Atmosphere Environment, Vol. 43, No. 1, 2008, pp. 23-30.
 T. Maruyama, M. Yoshida, K. Takase, H. Takimoto, S. Ishikawa and S. Nagasaka, “Relationship between Nitrogen Atmospheric Deposition, Discharge and Concentration, and Monthly Change of Those in a River, Japan,” Journal of Water Resources and Protection, Vol. 5, No. 3, 2013, pp. 283-293. doi:10.4236/jwarp.2013.53029