Dyfyniad APA

Williams, J. W., Cunningham, F. G., MacDonald, P. C., Gant, N. F., & Williams, J. W. (1989). Williams obstetrics. Appleton & Lange.

Dyfyniad Arddull Chicago

Williams, John Whitridge, F. Gary Cunningham, Paul C. MacDonald, Norman F. Gant, and John Whitridge Williams. Williams Obstetrics. Norwalk, CT: Appleton & Lange, 1989.

Dyfyniad MLA

Williams, John Whitridge, et al. Williams Obstetrics. Appleton & Lange, 1989.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.