Osburn, D. D. (1978). Modern agricultural management. National Book Store.
Cita Chicago (17th ed.)Osburn, Donald D. Modern Agricultural Management. Manila: National Book Store, 1978.
Cita MLA (9th ed.)Osburn, Donald D. Modern Agricultural Management. National Book Store, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.