Citazione APA

Williams, H. S. (1914). Twilight sleep: A simple account of new discoveries in painless childbirth. Harper.

Stile di citazione Chicago

Williams, Henry Smith. Twilight Sleep: A Simple Account of New Discoveries in Painless Childbirth. New York: Harper, 1914.

Citazione MLA

Williams, Henry Smith. Twilight Sleep: A Simple Account of New Discoveries in Painless Childbirth. Harper, 1914.