Παραπομπή APA

Sjo,John. (1976). Economics for Agriculturalists: A Beginning Text in Agricultural Economics. Copyright Grid. Inc.

Παραπομπή Chicago Style

Sjo,John. Economics for Agriculturalists: A Beginning Text in Agricultural Economics. Ohio: Copyright Grid. Inc, 1976.

Παραπομπή MLA

Sjo,John. Economics for Agriculturalists: A Beginning Text in Agricultural Economics. Copyright Grid. Inc, 1976.