Langford, P. (1987). Concept development in the primary school. Croom Helm.
Chicago Style (17th ed.) CitationLangford, Peter. Concept Development in the Primary School. London ; New York: Croom Helm, 1987.
ציטוט MLALangford, Peter. Concept Development in the Primary School. Croom Helm, 1987.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.