Wilmshurst, John, author
Redwood Press, 1985
Buku Teks
edited by Otto Kleppner and Irving Settel
Prentice-Hall, 1970
Buku Teks
Alexandra Cindy, author
2008
UI - Tesis (Open)
Gama Ramadita, author
Universitas Indonesia, 2005
UI - Tesis (Membership)
Sandage, C.H.
Richard D. Irwin, 1961
Buku Teks