Polkinghorne, R. K., & Polkinghorne, M. I. R. (1955). Fundamental number teaching. London: George G. Harrap.
Chicago Style CitationPolkinghorne, Ruby Kathleen, and Mabel Irene Rutherford Polkinghorne. Fundamental Number Teaching. London: George G. Harrap, 1955.
MLA CitationPolkinghorne, Ruby Kathleen, and Mabel Irene Rutherford Polkinghorne. Fundamental Number Teaching. London: George G. Harrap, 1955.
Warning: These citations may not always be 100% accurate.