Sjo,John. (1976). Economics for Agriculturalists: A Beginning Text in Agricultural Economics. Copyright Grid. Inc.
استشهاد بنمط شيكاغوSjo,John. Economics for Agriculturalists: A Beginning Text in Agricultural Economics. Ohio: Copyright Grid. Inc, 1976.
MLA استشهادSjo,John. Economics for Agriculturalists: A Beginning Text in Agricultural Economics. Copyright Grid. Inc, 1976.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.