APA

Okun B., Richardson R. W., . (1961). Studies in economic development. New York: Holt.

Chicago

Okun Bernard, Richardson Richard W, . 1961. Studies in economic development. New York: Holt.

Harvard

Okun B., Richardson R. W., . (1961). Studies in economic development. New York: Holt.

MLA

Okun Bernard, Richardson Richard W, . Studies in economic development. New York: Holt. 1961.