Dyfyniad APA

Gregory, P. R. (1999). Comparative economic systems. Houghton Mifflin.

Dyfyniad Arddull Chicago

Gregory, Paul R. Comparative Economic Systems. Houghton Mifflin, 1999.

Dyfyniad MLA

Gregory, Paul R. Comparative Economic Systems. Houghton Mifflin, 1999.

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