APA

Umbreit M. H., . (1950). Modern economic problems. New York: McGraw-Hill.

Chicago

Umbreit Myron Henry, . 1950. Modern economic problems. New York: McGraw-Hill.

Harvard

Umbreit M. H., . (1950). Modern economic problems. New York: McGraw-Hill.

MLA

Umbreit Myron Henry, . Modern economic problems. New York: McGraw-Hill. 1950.