Stewart, Elbert W.
Tata McGraw-Hill, 1981
Buku Teks
Bell, Earl H.
Harper & Row, 1965
Buku Teks
Mavis Biesanz
Prentice-Hall, 1969
Buku Teks
Currier, Glenn
Harcourt, college Pub., 1997
Buku Teks
Collins, Randall, author
Oxford University Press , 1992
Buku Teks