*Williams Obstetrics, 20th edition
Gary Cunningham, Paul C. MacDonald, Norman F. Gant, Kenneth J. Leveno, Larry C. Gilstrap, Gary D.V. Hankins, Steven L. Clark. (1997). Stamford, Conn: Appleton & Lange. NLM ID: 9703148 (1997). Stamford, Conn: Appleton & Lange

Williams Obstetrics, 19th edition
Gary Cunningham, Paul C. MacDonald, Norman F. Gant, Kenneth J. Leveno, Larry C. Gilstrap. (1993). Norwalk, Conn: Appleton & Lange. NLM ID: 9702575 (1993). Norwalk, Conn: Appleton & Lange

Williams Obstetrics, 18th edition
Gary Cunningham, Paul C. MacDonald, Norman F. Gant, J Whitridge Williams. (1989). Norwalk, Conn: Appleton & Lange. NLM ID: 8813210 (1989). Norwalk, Conn: Appleton & Lange

Williams Obstetrics, 17th edition
Whitridge Williams, Jack A. Pritchard, Paul C. MacDonald, Norman F. Gant. (1985). New York: Appleton-Century-Crofts. NLM ID: 8408069 (1985). New York: Appleton-Century-Crofts

Williams Obstetrics, 16th edition
Jack A. Pritchard, Paul C. MacDonald, J Whitridge Williams. (1980). New York: Appleton-Century-Crofts. NLM ID: 8005302 (1980). New York: Appleton-Century-Crofts

Williams Obstetrics, 15th edition
Paul C. MacDonald, Jack A. Pritchard, J Whitridge Williams. (1976). New York: Appleton-Century-Crofts. NLM ID: 7611685 (1976). New York: Appleton-Century-Crofts