Dyfyniad APA

Isard, W. (1975). Introduction to regional science. Prentice-Hall of India.

Dyfyniad Arddull Chicago

Isard, Walter. Introduction to Regional Science. New Jersey: Prentice-Hall of India, 1975.

Dyfyniad MLA

Isard, Walter. Introduction to Regional Science. Prentice-Hall of India, 1975.

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