See Allo

Bartholomew, Paul C., author

Littlefield, Adams, 1959

Buku Teks

edited by Robert T. Golembiewski, Frank Gibson, Geoffrey Y. Cornog

Rand McNally College, 1972

Buku Teks

Pfiffner, John M., author

Ronald Press, 1960

Buku Teks

Denhardt, Robert B., author

Harcourt College, 1999

Buku Teks

Denhardt, Robert B., author

Thomson, 2009

Buku Teks

Berkley, George E., author

McGraw-Hill Higher Education, 2009

Buku Teks