APA
Ziegel E., Blarcom C. C. V., . (1972). Obstetric nursing. New York: MacMillan.
Chicago
Ziegel Erna, Blarcom Colrolyn Conant Van, . 1972. Obstetric nursing. New York: MacMillan.
Harvard
Ziegel E., Blarcom C. C. V., . (1972). Obstetric nursing. New York: MacMillan.
MLA
Ziegel Erna, Blarcom Colrolyn Conant Van, . Obstetric nursing. New York: MacMillan. 1972.