Fraser, Marshall, author
Page Ficklin, 1974
Buku Teks
Bruce, William J., author
Appleton-Century-Crofts, 1971
Buku Teks
Mueller, Francis J., author
Dickenson , 1966
Buku Teks
Rees, Paul K., author
McGraw-Hill , 1971
Buku Teks
Stevens, Lee A., author
Wadsworth, 1970
Buku Teks