Dyfyniad APA

Swick, E. (2005). Practice makes perfect English pronouns and prepositions. New York: McGraw Hill.

Dyfyniad Arddull Chicago

Swick, Ed. Practice Makes Perfect English Pronouns and Prepositions. New York: McGraw Hill, 2005.

Dyfyniad MLA

Swick, Ed. Practice Makes Perfect English Pronouns and Prepositions. New York: McGraw Hill, 2005.

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