Dyfyniad APA

(1980). BUSINESS ECONOMICS: Made Simple. [s.n].

Dyfyniad Arddull Chicago

BUSINESS ECONOMICS: Made Simple. [s.i]: [s.n], 1980.

Dyfyniad MLA

BUSINESS ECONOMICS: Made Simple. [s.n], 1980.

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