Jackson, Andrew R.W., author
Longman, 1996
Buku Teks
Otto Soemarwoto, author
Gramedia Pustaka Utama, 1991
Buku Teks
Otto Soemarwoto, author
Gramedia Pustaka Utama, 1992
Buku Teks
Information Dynamic, Inc. , 1981
Buku Teks
proposed by Centre for Research of Human Resources and the Environment
University of Indonesia, 1990
Buku Teks