Dyfyniad APA

Armstrong, W. H. (1967). Study is hard work (2nd ed.). Harper $ row.

Dyfyniad Arddull Chicago

Armstrong, William H. Study Is Hard Work. 2nd ed. New York: Harper $ row, 1967.

Dyfyniad MLA

Armstrong, William H. Study Is Hard Work. 2nd ed. Harper $ row, 1967.

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