Ullmann, Julian, author
Clarendon Press, 1985
Buku Teks
Mohammad Hidayat, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 1994
UI - Skripsi (Membership)
Byers, Robert A., author
Ashton-Tate, 1982
Buku Teks
Bai, Ying, author
John Wiley & Sons, 2011
Buku Teks
Teorey, Toby J.
Englewood Cliffs, NJ: Prentice-Hall, 1982
Buku Teks