Cita APA (7th ed.)
Koh, K. M., & Tay, E. G. (2002). Counting. World Scientific.
Cita Chicago (17th ed.)
Koh, K. M., i Eng Guan Tay. Counting. River Edge, NJ: World Scientific, 2002.
Cita MLA (9th ed.)
Koh, K. M., i Eng Guan Tay. Counting. World Scientific, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.