Cita APA (7th ed.)

Cunningham, F. G., & Williams, J. W. (1997). Williams obstetrics. Appleton & Lange; Prentice-Hall International.

Cita Chicago (17th ed.)

Cunningham, F. Gary, i John Whitridge Williams. Williams Obstetrics. Norwalk, CT: Appleton & Lange; Prentice-Hall International, 1997.

Cita MLA (9th ed.)

Cunningham, F. Gary, i John Whitridge Williams. Williams Obstetrics. Appleton & Lange; Prentice-Hall International, 1997.