APA استشهاد

Langford, P. (1987). Concept development in the primary school. Croom Helm.

استشهاد بنمط شيكاغو

Langford, Peter. Concept Development in the Primary School. London: Croom Helm, 1987.

MLA استشهاد

Langford, Peter. Concept Development in the Primary School. Croom Helm, 1987.