APA

Allen C. ., Oxford University Press, . (19). Textbook of psychosexual disorders. London: Oxford University Press.

Chicago

Allen Clifford, Oxford University Press, . 19. Textbook of psychosexual disorders. London: Oxford University Press.

Harvard

Allen C. ., Oxford University Press, . (19). Textbook of psychosexual disorders. London: Oxford University Press.

MLA

Allen Clifford, Oxford University Press, . Textbook of psychosexual disorders. London: Oxford University Press. 19.