Humpries, James T
Delmar Publisher, 1993
Buku Teks
Humphries, James T.
Breton Publishers, 1983
Buku Teks
Petruzella, Frank D., author
McGraw-Hill, 1996
Buku Teks
Beach, David P.
Prentice-Hall, 1990
Buku Teks
Chute, George M., author
McGraw-Hill, 1981
Buku Teks