Case, Karl E., author
Prentice-Hall, 1999
Buku Teks
Henderson, J. Vernon, author
Heath and Com, 1991
Buku Teks
Ferguson, C. E., author
Holt, Rinehart and Winston, 1962
Buku Teks
Ferguson, C. E., author
Holt, Rinehart and Winston, 1965
Buku Teks
Case, Karl E., author
Pearson, 2017
Buku Teks