Dyfyniad APA

Langford, P. (1987). Concept devolopment in the secondary school. Croom Helm.

Dyfyniad Arddull Chicago

Langford, Peter. Concept Devolopment in the Secondary School. London: Croom Helm, 1987.

Dyfyniad MLA

Langford, Peter. Concept Devolopment in the Secondary School. Croom Helm, 1987.

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