Dyfyniad APA

Heyel, C. (1955). Foreman's handbook/3e (3rd ed.). Mc graw hill book company.

Dyfyniad Arddull Chicago

Heyel, Carl. Foreman's Handbook/3e. 3rd ed. New York: Mc graw hill book company, 1955.

Dyfyniad MLA

Heyel, Carl. Foreman's Handbook/3e. 3rd ed. Mc graw hill book company, 1955.

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