Gaya APA

[et.al.], F, G, C. (1997). Williams Obstetrics 20th Edition (20). New York: New York: Simon and Schuster,.

Gaya MLA

[et.al.], F., Gary, Cunningham. "Williams Obstetrics 20th Edition". 20 New York: New York: Simon and Schuster,, 1997. Teks.