Langford, P. (1987). Concept development in the primary school. Croom Helm.
استشهاد بنمط شيكاغوLangford, Peter. Concept Development in the Primary School. London: Croom Helm, 1987.
MLA استشهادLangford, Peter. Concept Development in the Primary School. Croom Helm, 1987.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.