Dyfyniad APA

Jones, L. (1986). Progress to Proficiency: Student's Book. Cambridge: Cambridge University.

Dyfyniad Arddull Chicago

Jones, Leo. Progress to Proficiency: Student's Book. Cambridge: Cambridge University, 1986.

Dyfyniad MLA

Jones, Leo. Progress to Proficiency: Student's Book. Cambridge: Cambridge University, 1986.

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