S. K. Grebe, R. R. Cooke and H. C. Ford, “Treatment of Hypothyroidism with Once Weekly Thyroxine,” Journal of Clinical Endocrinology and Metabolism, Vol. 82, No. 3, 1997, pp. 870-875. doi:10.1210/jc.82.3.870
 L. H. Fish, H. L. Schwartz, J. Cavanaugh, M. W. Steffes, J. P. Bantle and J. H. Oppenheimer, “Replacement Dose, Metabolism, and Bioavailability of Levothyroxine in the Treatment of Hypothyroidism. Role of Triiodothyronine in Pituitary Feedback in Humans,” The New England Journal of Medicine, Vol. 316, 1987, pp. 764-770. doi:10.1056/NEJM198703263161302
 S. Benvenga, L. Bartolone, M. A. Pappalardo, A. Russo, D. Lapa, G. Giorgianni, G. Saraceno and F. Trimarchi, “Altered Intestinal Absorption of L-Thyroxine Caused by Coffee,” Thyroid, Vol. 18, No. 3, 2008, pp. 293-301. doi:10.1089/thy.2007.0222
 Y. Liel, I. Harman-Boehm and S. Shany, “Evidence for a Clinically Important Adverse Effect of Fiber-Enriched Diet on the Bioavailability of Levothyroxine in Adult Hypothyroid Patients,” Journal of Clinical Endocrinology and Metabolism, Vol. 81, No. 2, 1996, pp. 857-859. doi:10.1210/jc.81.2.857
 N. Bolk, T. J. Visser, A. Kalsbeek, R. T. van Domburg and A. Berghout, “Effects of Evening vs Morning Thyroxine Ingestion on Serum Thyroid Hormone Profiles in Hypothyroid Patients,” Clinical Endocrinology, Vol. 66, 2007, pp. 43-48.
 L. Liwanpo and J. M. Hershman, “Conditions and Drugs Interfering with Thyroxine Absorption,” Best Practice and Research Clinical Endocrinology and Metabolism, Vol. 23, No. 6, 2009, pp. 781-792. doi:10.1016/j.beem.2009.06.006
 V. Srinivas and S. O. Oyibo, “Levothyroxine Pseudomalabsorption and Thyroxine Absorption Testing with Use of High-Dose Levothyroxine: Case Report and Discussion,” Endocrine Practice, Vol. 16, No. 6, 2010, pp. 1012-1015. doi:10.4158/EP10224.CR