APA

Kopp K. W., . (1949). History of Economic thought. New York: Barnes & Noble.

Chicago

Kopp K William, . 1949. History of Economic thought. New York: Barnes & Noble.

Harvard

Kopp K. W., . (1949). History of Economic thought. New York: Barnes & Noble.

MLA

Kopp K William, . History of Economic thought. New York: Barnes & Noble. 1949.