Boehm, E.A., author
Longman, 1971
Buku Teks
Forbes, Dean K.
LP3ES, 1986
Buku Teks
Alvin Y. So, author
Sage Publications, 1990
Buku Teks
Forrester, Marion Wallace
Mouton & Co, 1962
Buku Teks
Hall, Calvin S. (Calvin Springer), 1909-1985, author
Kanisius, 1993
Buku Teks