APA استشهاد

Gray, A. (1931). Development of economic doctrine: An introductory survey.

استشهاد بنمط شيكاغو

Gray, Alexander. Development of Economic Doctrine: An Introductory Survey. Longmans Green & Company, London, 1931.

MLA استشهاد

Gray, Alexander. Development of Economic Doctrine: An Introductory Survey. 1931.