Highsmith, Richard M., Jr.
J.B.Lippincott Co., 1963
Buku Teks
Mackinnon, Danny, author
Routledge, 2019
Buku Teks
Deris Yuhetra, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2014
UI - Skripsi Membership
prepared by the Cartographic Department of the Clarendon Press
Oxford University Press, 1972
Buku Referensi
Boyce, Ronald Reed, author
John Wiley & Sons, 1982
Buku Teks