Case, Karl E., author
Pearson, Prentice Hall, 2009
Buku Teks
Mankiw, N. Gregory, author
Harcout College, 1998
Buku Teks
Boulding, Kenneth E. (Kenneth Ewart), 1910-1993, author
Tata McGraw-Hill, 1970
Buku Teks
Case, Karl E., author
Prentice-Hall, 2004
Buku Teks
Case, Karl E., author
Prentice-Hall, 1996
Buku Teks