Dyfyniad APA

Crossfield. (1977). How to develop executive skills. Crossfield.

Dyfyniad Arddull Chicago

Crossfield. How to Develop Executive Skills. New Delhi: Crossfield, 1977.

Dyfyniad MLA

Crossfield. How to Develop Executive Skills. Crossfield, 1977.

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