Dyfyniad APA

GILL, R. T. (1967). Economic development: Past and present. Prentice-Hall.

Dyfyniad Arddull Chicago

GILL, Richard T. Economic Development: Past and Present. New Jersey: Prentice-Hall, 1967.

Dyfyniad MLA

GILL, Richard T. Economic Development: Past and Present. Prentice-Hall, 1967.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.