Scott, James D.
Prentice-Hall, 1953
Buku Teks
Wells, William D., author
Prentice-Hall, 2000
Buku Teks
Wells, William D., author
Prentice-Hall, 2000
Buku Teks
Moriarty, Sandra E. (Sandra Ernst), author
Pearson, 2012
Buku Teks
Wells, William D., author
Prentice-Hall, 1988
Buku Teks