Dyfyniad APA

Penson,John B. (1986). Introduction to agricultural economics. Prentice Hall.

Dyfyniad Arddull Chicago

Penson,John B. Introduction to Agricultural Economics. New Jersey: Prentice Hall, 1986.

Dyfyniad MLA

Penson,John B. Introduction to Agricultural Economics. Prentice Hall, 1986.

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