Croxton, Frederick E., author
Prentice-Hal, 1967
Buku Teks
Hartkemeler, Harry P., author
Dickenson Publishing, 1868
Buku Teks
Croxton, Frederick E., author
Prentice-Hall, 1960
Buku Teks
Chartrand, Gary
Prindle, Weber & Schmidt , 1977
Buku Teks
Neter, John, author
Allyn and Bacon, 1993
Buku Teks