Gangel, K. O. (1984). Feeding & leading. Victor Books.
Cita Chicago (17th ed.)Gangel, Kenneth O. Feeding & Leading. United States: Victor Books, 1984.
Cita MLA (9th ed.)Gangel, Kenneth O. Feeding & Leading. Victor Books, 1984.
Atenció: Aquestes cites poden no estar 100% correctes.