Collier, J. R. (1968). Effective long range business planning. Prentice-Hall of India.
Dyfyniad Arddull ChicagoCollier, James R. Effective Long Range Business Planning. New Jersey: Prentice-Hall of India, 1968.
Dyfyniad MLACollier, James R. Effective Long Range Business Planning. Prentice-Hall of India, 1968.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.