U.S. department of commerce. (1921). Survey of current business. U.S. department of commerce.
استشهاد بنمط شيكاغوU.S. department of commerce. Survey of Current Business. Washington D.C: U.S. department of commerce, 1921.
MLA استشهادU.S. department of commerce. Survey of Current Business. U.S. department of commerce, 1921.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.