APA استشهاد

Okun, B., & Richardson, R. W. (1965). Studies in economic development. Hott, rinehart and winston.

استشهاد بنمط شيكاغو

Okun, Bernard, و Richard W. Richardson. Studies in Economic Development. London: Hott, rinehart and winston, 1965.

MLA استشهاد

Okun, Bernard, و Richard W. Richardson. Studies in Economic Development. Hott, rinehart and winston, 1965.