Kim, Tae-Kil, author
dae Kwang Munwhasa, 1990
Buku Teks
Freeman, A. Myrick, 1936-, author
Resources for the Future, 1993
Buku Teks
Wong Siu-Lun University of Hongkong, 1992
Buku Teks
Teddy Nurcahyawan, author
2005
Artikel Jurnal
Rokeach, Milton
Jossey-Bass Publishers, 1980
Buku Teks