Carlson, Paul A.
South Western, 1957
Buku Teks
edited by E.M. Kirkpatrick ; assistant editors, C.M. Schwarz ... [and others]
Chambers, 1983
Buku Referensi
Berle, Adolf A., Jr.
Harcourt, Brace, 1954
Buku Klasik
edited and selected by Benjamin Nelson
George Allen and Unwin, 1958
Buku Teks
Prijono Tjiptoherijanto, 1948-
National Family Planning Coordinating Board , 1997
Buku Teks