Clemson, D., & Clemson, W. (1994). Mathematics in the early years. Routledge.
芝加哥风格引文Clemson, David, 与 Wendy Clemson. Mathematics in the Early Years. London ; New York: Routledge, 1994.
MLA引文Clemson, David, 与 Wendy Clemson. Mathematics in the Early Years. Routledge, 1994.
警告：这些引文格式不一定是100％准确.