Speight, James G., author
Wlley, 2016
Buku Teks
Davis, Michael H.
Routledge, 1999
Buku Teks
[edited by] Lucy Frith and Heather Draper
Books for Midwives , 2004
Buku Teks
Thompson, Joyce Beebe, author
Macmillan, 1981
Buku Teks
Healey, Edwin F., author
Loyola University Press, 1956
Buku Teks