Conrad, Earl
New York, 1961
Buku Teks
Carnegie, Dale
Apollo, [date of publication not identified]
Buku Teks
Malik, Adam
Gunung Agung, 1976
Buku Teks
Bintoro Tjokroamidjojo, author
[publisher not identified], 2001
Buku Teks
Jalaluddin Rakhmat, author
Remaja Rosdakarya, 1998
Buku Teks