Wolf, Thomas, author
A fireside Book, 1990
Buku Teks
Haimann, Theo, author
Houghton Mifflin, 1974
Buku Teks
Likert, Rensis
McGraw-Hill Kogakusha, 1967
Buku Teks
F.X. Soedjadi, author
Gunung Agung, 1996
Buku Teks
F.X. Soedjadi, author
Haji Masagung, 1994
Buku Teks