Παραπομπή APA

Freud ,Sigmund. (1991). On sexuality. Penguin Books.

Παραπομπή Chicago Style

Freud ,Sigmund. On Sexuality. Penguin Books: Penguin Books, 1991.

Παραπομπή MLA

Freud ,Sigmund. On Sexuality. Penguin Books, 1991.