Ellis, H., & Ellis, H. (1921). Sudies in the psychology of sex: By Ellis Havelock (3. Auflage, revised and enlarged.). Davis.
Lua i Stíl Chicago (17ú heag.)Ellis, Havelock, agus Havelock Ellis. Sudies in the Psychology of Sex: By Ellis Havelock. 3. Auflage, revised and enlarged. Philadelphia: Davis, 1921.
Lua MLA (8ú heag.)Ellis, Havelock, agus Havelock Ellis. Sudies in the Psychology of Sex: By Ellis Havelock. 3. Auflage, revised and enlarged. Davis, 1921.
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