Dyfyniad APA

Nobbs, J. (1973). Economics for advanced level. McGraw Hill.

Dyfyniad Arddull Chicago

Nobbs, Jack. Economics for Advanced Level. London: McGraw Hill, 1973.

Dyfyniad MLA

Nobbs, Jack. Economics for Advanced Level. McGraw Hill, 1973.

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