Kiver, Milton S.
D. Van Nostrand Company, Inc., 1960
Buku Teks
Smith, Howard M.
John Wiley & Sons, 1975
Buku Teks
Ploeger, Katherine M.
NTC Publishing Group, 2000
Buku Teks
Howard, William M.
McGraw-Hill , 1967
Buku Teks
Kleinman, R.L.
International Planned Parenthood Federation, 1971
Buku Teks