Dyfyniad APA

Sapsford,David, & Ladd,James. (1978). Essential economics. Hart-Davis Educational.

Dyfyniad Arddull Chicago

Sapsford,David, and Ladd,James. Essential Economics. Great Britain: Hart-Davis Educational, 1978.

Dyfyniad MLA

Sapsford,David, and Ladd,James. Essential Economics. Hart-Davis Educational, 1978.

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