APA (7th ed.) Citation

Wassmann, J. (1994). Yupno number system and counting. Journal of cross-cultural psychology, 25(2), .

Chicago Style (17th ed.) Citation

Wassmann, Jürg. "Yupno Number System and Counting." Journal of Cross-cultural Psychology 25, no. 2 (1994).

MLA (9th ed.) Citation

Wassmann, Jürg. "Yupno Number System and Counting." Journal of Cross-cultural Psychology, vol. 25, no. 2, 1994.