Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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