Cita APA (7th ed.)

Williams, J. W., Hellman, L. M., & Pritchard, J. A. (1971). Williams obstetrics. JMC Press.

Cita Chicago (17th ed.)

Williams, J. Whitridge, Louis M. Hellman, i Jack A. Pritchard. Williams Obstetrics. Quezon City: JMC Press, 1971.

Cita MLA (9th ed.)

Williams, J. Whitridge, et al. Williams Obstetrics. JMC Press, 1971.