Case, Karl E., author
Principles of economics
Prentice-Hall, 2004
 Buku Teks
Case, Karl E., author
Principles of economics
Prentice-Hall, 1996
 Buku Teks
Case, Karl E., author
Principles of economics
Prentice-Hall, 2002
 Buku Teks
Case, Karl E., author
Principles of economics
Prentice-Hall, 1999
 Buku Teks
Henderson, J. Vernon, author
Principles of economics
Heath and Com, 1991
 Buku Teks