Sandage, C.H.
Richard D. Irwin, 1961
Buku Teks
Wells, William D., author
Prentice-Hall, 2000
Buku Teks
Gomez, Julita R.
National Book Store, 1986
Buku Teks
Sutherland, Max, author
PPM, 2004
Buku Teks
Sissors, Jack Z
NTC Businness Books, 1993
Buku Teks