Eastman, N., & Hellman, L. M. (1961). Williams Obstetrics (12.ed.). Appleton-Century-Croffts.
Chicagoスタイル(17版)引用形式Eastman, Nicholson, , Louis M. Hellman. Williams Obstetrics. 12.ed. New York: Appleton-Century-Croffts, 1961.
MLA(9版)引用形式Eastman, Nicholson, , Louis M. Hellman. Williams Obstetrics. 12.ed. Appleton-Century-Croffts, 1961.
警告: この引用は必ずしも正確ではありません.