Gaya APA

Billings, J, J. (1974). The ovulation method, [5th ed.]. Cet.pertama 1964. . Melbourne: Advocate Press.

Gaya MLA

Billings, John, J.. "The ovulation method, [5th ed.]. Cet.pertama 1964. ". Melbourne: Advocate Press, 1974. Buku.