Kosters, Marvin H., author
American Enterprise Institute for Public Policy Research, 1975
Buku Teks
Reisman, George, author
Caroline House Publishers, 1979
Buku Teks
Zoffer, Gerald R., author
McGraw-Hill, 1980
Buku Teks
N.Y. McGraw-Hill, 1976
Buku Teks
Steiner, George A. (George Albert), 1912-, author
McGraw-Hill, 1953
Buku Teks