Santrock, John W., author
Erlangga, 2003
Buku Teks
McDavid, John W.
Harper & Row Publishers, 1968
Buku Teks
Albright, John
Office of the Chief of Military History United States Army, 1970
Buku Teks
Lazarsfeld, Paul F., author
Houghton Mifflin, 1968
Buku Teks
Guiltinan, Joseph P.
McGraw-Hill , 1991
Buku Teks