McDonald, T. Marll, author
Houghton-Miffiln, 1974
Buku Teks
Margenau, Henry, author
Time Incorporated, 1964
Buku Referensi
Arczewski, K., author
Ellis Horwood , 1993
Buku Teks
edited by Kenneth J. Arrow, Samuel Karlin, and Patrick Suppes
Stanford University Press, 1960
Buku Teks
Fletcher, Glenn, author
Wm. C. Brown, 1994
Buku Teks