Langford, P. (1987). Concept development in the primary school. Croom Helm.
芝加哥风格引文Langford, Peter. Concept Development in the Primary School. London ; New York: Croom Helm, 1987.
MLA引文Langford, Peter. Concept Development in the Primary School. Croom Helm, 1987.
警告：这些引文格式不一定是100％准确.