Schoell, William F.
Allyn and Bacon, 1988
Buku Teks
Hise, Richard T., author
Winthrop, 1979
Buku Teks
Ryan, William T.
Richard D. Irwin, 1981
Buku Teks
Ryan, William T
Richard D. Irwin, 1980
Buku Teks
Cox, William E. Jr.
N.Y. John Wiley c., 1979
Buku Teks