Dyfyniad APA

Johnson, D. A., & Lund, C. H. (1967). Bulletin Board Displays for Mathematics. California: M&T.

Dyfyniad Arddull Chicago

Johnson, Donovan A., và Charles H. Lund. Bulletin Board Displays for Mathematics. California: M&T, 1967.

Dyfyniad MLA

Johnson, Donovan A., và Charles H. Lund. Bulletin Board Displays for Mathematics. California: M&T, 1967.

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