Dyfyniad APA

Olson, J. F. (1997). Grammar essentials. New York: Learning Express.

Dyfyniad Arddull Chicago

Olson, Judith F. Grammar Essentials. New York: Learning Express, 1997.

Dyfyniad MLA

Olson, Judith F. Grammar Essentials. New York: Learning Express, 1997.

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