Dyfyniad APA

John Costello. (1991). Teaching and learning mathematics 11-16. London: Routledge.

Dyfyniad Arddull Chicago

John Costello. Teaching and Learning Mathematics 11-16. London: Routledge, 1991.

Dyfyniad MLA

John Costello. Teaching and Learning Mathematics 11-16. London: Routledge, 1991.

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