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4. Brown-Séquard, C. E. E., “Des effets produits chez l’homme par des injections souscutanées d’un liquide retiré des testicules frais de cobaye et de chien.” C.r. Séanc. Soc. Biol. I (1889), pp. 420–430, cited by Goodman and Gilman, 1965.
5. Butenandt, A, A., “Über die Chemische Untersuchung der Sexual-hormons,” Z. Angew. Chem. 44 (1931), p. 44, cited by Goodman and Gilman, 1965.