Klinefelter, H.F., Jr.; Reifenstein, E.C., Jr.; Albright, F. (1942). «Syndrome characterized by gynaecomastia, aspermatogenesis without a-Leydigism, and increased excretion of follicle stimulating hormone». Journal of Clinical Endocrinology & Metabolism2 (11): 615-627. doi:10.1210/jcem-2-11-615.
Jacobs, Patricia A.; Strong, J.A. (1959). «A case of human intersexuality having a possible XXY sex-determining mechanism». Nature183 (4657): 3-2-303. doi:10.1038/183302a0.