Petrides, George A., author
Houghton Mifflin, 1988
Buku Teks
Miller, Howard A.
Wm. C.Brown, 1978
Buku Teks
Grolier Incorporated, 1964
Buku Referensi
Peterson, Lee Allen, author
Houghton Miffiln, 1977
Buku Teks
Borror, Donald J., author
Houghton Mifflin, 1976
Buku Referensi