APA

Gray A., . (1931). The development of economic doctrine: an introductory survey. New York: Longmans, Green.

Chicago

Gray Alexander, . 1931. The development of economic doctrine: an introductory survey. New York: Longmans, Green.

Harvard

Gray A., . (1931). The development of economic doctrine: an introductory survey. New York: Longmans, Green.

MLA

Gray Alexander, . The development of economic doctrine: an introductory survey. New York: Longmans, Green. 1931.