Straffin, Philip D. (February 1996). "Corrected Figure for Position Graphs for Pong Hau K'i and Mu Torere". Mathematics Magazine. 69 (1): 65. doi:10.1080/0025570X.1996.11996390. JSTOR2691405.
Straffin, Philip D. (February 1996). "Corrected Figure for Position Graphs for Pong Hau K'i and Mu Torere". Mathematics Magazine. 69 (1): 65. doi:10.1080/0025570X.1996.11996390. JSTOR2691405.