editor, Terrell Croft [and others]
McGraw-Hill, 1981
Buku Referensi
Bowden, Edwin T., author
Holt, Rinehart and Winston, 1963
Buku Teks
Sheehan, Michael, author
Prentice-Hall, 1991
Buku Referensi
Maimon, Elaine P., author
McGraw-Hill , 2003
Buku Referensi
Hodges, John C., author
Harcourt Brace Jovanovich, 1972
Buku Teks