(Ingelesez)Hoermann R, Spoettl G, Moncayo R, Mann K. (1990eko uztaila). «Evidence for the presence of human chorionic gonadotropin (hCG) and free beta-subunit of hCG in the human pituitary» J. Clin. Endocrinol. Metab. 71 (1): 179-86. doi:10.1210/jcem-71-1-179. PMID1695224..
(Ingelesez)Hoermann R, Spoettl G, Moncayo R, Mann K. (1990eko uztaila). «Evidence for the presence of human chorionic gonadotropin (hCG) and free beta-subunit of hCG in the human pituitary» J. Clin. Endocrinol. Metab. 71 (1): 179-86. doi:10.1210/jcem-71-1-179. PMID1695224..