Woolford, Donald Mark, author
University of Queensland Press, 1976
Buku Teks
Robson, R.W., author
Pacific Publications PTY, 1954
Buku Teks
Wilson, Lindsay
McGraw-Hill , 1975
Buku Teks
Risya Nurfitriani, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2013
UI - Skripsi (Membership)
Australian Agency for International Development, 1995
Buku Teks