Wylie, M.R.J.
Academic Press, 1963
Buku Teks
Marjoko, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 1991
UI - Skripsi (Membership)
Farina, Mario V., author
Reston Publishing Company, 1973
Buku Teks
Hasibuan, Shane M., author
Universitas Indonesia, 2007
UI - Skripsi (Membership)
Irma Hermawaty, author
2008
UI - Tesis (Open)