APA

Grayson H., . (1958). Principles of economics. New York: American Book.

Chicago

Grayson Henry, . 1958. Principles of economics. New York: American Book.

Harvard

Grayson H., . (1958). Principles of economics. New York: American Book.

MLA

Grayson Henry, . Principles of economics. New York: American Book. 1958.