Dyfyniad APA

Heilbroner, R. L. (1991). Worldly Philosophers: The lives, times and ideas of the great economic thinkers (6th.). Penguin Books.

Dyfyniad Arddull Chicago

Heilbroner, Robert L. Worldly Philosophers: The Lives, Times and Ideas of the Great Economic Thinkers. 6th. London: Penguin Books, 1991.

Dyfyniad MLA

Heilbroner, Robert L. Worldly Philosophers: The Lives, Times and Ideas of the Great Economic Thinkers. 6th. Penguin Books, 1991.

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