Cita APA (7a ed.)

Beller, F. K., & Weir, R. F. (1994). The beginning of human life. Kluwer Academic Publishers.

Cita Chicago Style (17a ed.)

Beller, Fritz K., y Robert F. Weir. The Beginning of Human Life. Dordrecht [etc.]: Kluwer Academic Publishers, 1994.

Cita MLA (9a ed.)

Beller, Fritz K., y Robert F. Weir. The Beginning of Human Life. Kluwer Academic Publishers, 1994.