Dyfyniad APA
McCrimmon, J. M., & Trimmer, J. F. (1988). Writing with a purpose (9th ed.). Houghton Mifflin.
Dyfyniad Arddull Chicago
McCrimmon, James McNab, and Joseph F. Trimmer. Writing with a Purpose. 9th ed. Boston: Houghton Mifflin, 1988.
Dyfyniad MLA
McCrimmon, James McNab, and Joseph F. Trimmer. Writing with a Purpose. 9th ed. Houghton Mifflin, 1988.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.