APA

Phelps E. S., . (1966). Problems of the modern economy. New York: Norton.

Chicago

Phelps Edmund S, . 1966. Problems of the modern economy. New York: Norton.

Harvard

Phelps E. S., . (1966). Problems of the modern economy. New York: Norton.

MLA

Phelps Edmund S, . Problems of the modern economy. New York: Norton. 1966.