Dyfyniad APA

Vickery, B. C. (1965). On retrieval system theory (2nd ed.). London.

Dyfyniad Arddull Chicago

Vickery, B. C. On Retrieval System Theory. 2nd ed. Butterworths: London, 1965.

Dyfyniad MLA

Vickery, B. C. On Retrieval System Theory. 2nd ed. London, 1965.

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