APA Citation

Polkinghorne, R. K., & Polkinghorne, M. I. R. (1955). Fundamental number teaching. London: George G. Harrap.

Chicago Style Citation

Polkinghorne, Ruby Kathleen, and Mabel Irene Rutherford Polkinghorne. Fundamental Number Teaching. London: George G. Harrap, 1955.

MLA Citation

Polkinghorne, Ruby Kathleen, and Mabel Irene Rutherford Polkinghorne. Fundamental Number Teaching. London: George G. Harrap, 1955.

Warning: These citations may not always be 100% accurate.