Park, Chris, author
Routledge, 1997
Buku Referensi
Fajar Winarsih, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2014
UI - Skripsi (Membership)
Australian Goverment Publishing Service, 1985
Buku Teks
The Association of Southeast Asian Institution of Higher Learning
Airlangga University Press, 1991
Buku Referensi
Walter, Eugene Victor, author
Chapel Hill, 1988
Buku Teks