APA aipamena

Heilbroner, R. L. (1968). The economic problem. New York: Prentice-Hall.

Chicago Style aipamena

Heilbroner, Robert L. The Economic Problem. New York: Prentice-Hall, 1968.

MLA aipamena

Heilbroner, Robert L. The Economic Problem. New York: Prentice-Hall, 1968.