APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (8:e uppl.)

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