Cita APA (7a ed.)

(1989). Papers from the IV World Congress on Gestational Trophoblastic Diseases, Beijing, China, September 1988: 1988. [s.n.].

Cita Chicago Style (17a ed.)

Papers from the IV World Congress on Gestational Trophoblastic Diseases, Beijing, China, September 1988: 1988. New Haven, CT: [s.n.], 1989.

Cita MLA (9a ed.)

Papers from the IV World Congress on Gestational Trophoblastic Diseases, Beijing, China, September 1988: 1988. [s.n.], 1989.