Anshar Rahman, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2021
UI - Skripsi (Membership)
Kayleen M. Hazlehurst
Avebury, 2001
Buku Teks
Ripley, William Z.
Little, Brown, and Company, 1927
Buku Teks
Johnson, Carol, author
Allen and Unwin, 1989
Buku Teks
Zainah Anwar, author
Yayasan Mohamed Noah; Petaling Jaya, Selangor, Malaysia , 2011
Buku Referensi