Cita APA

Elder, M. G. E., Lamont, R. F. E., & Romero, R. E. (1997). Preterm labor.

Chicago Edition Citation

Elder, Murdo G; Ed, Ronald F; Ed Lamont, i Roberto; Ed Romero. Preterm Labor. New York, Churchill Livingstone, 1997.

Cita MLA

Elder, Murdo G; Ed, et al. Preterm Labor. 1997.