Dyfyniad APA

Orley C. Ashenfelter and David Card. (1999). Handbook of Labor Economics. ELSEVIER.

Dyfyniad Arddull Chicago

Orley C. Ashenfelter and David Card. Handbook of Labor Economics. ELSEVIER, 1999.

Dyfyniad MLA

Orley C. Ashenfelter and David Card. Handbook of Labor Economics. ELSEVIER, 1999.

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