APA

Umbreit M. H., . (1957). Economics: an introduction to principles and problems. New York: McGraw-Hill.

Chicago

Umbreit Myron Henry, . 1957. Economics: an introduction to principles and problems. New York: McGraw-Hill.

Harvard

Umbreit M. H., . (1957). Economics: an introduction to principles and problems. New York: McGraw-Hill.

MLA

Umbreit Myron Henry, . Economics: an introduction to principles and problems. New York: McGraw-Hill. 1957.