APA (7th ed.) Citation
Yeo, A. (2006). Are you the king or are you the joker?: Play math for young children. World Scientific.
Chicago Style (17th ed.) Citation
Yeo, Adrian. Are You the King or Are You the Joker?: Play Math for Young Children. Hackensack, N.J.: World Scientific, 2006.
MLA (9th ed.) Citation
Yeo, Adrian. Are You the King or Are You the Joker?: Play Math for Young Children. World Scientific, 2006.
Warning: These citations may not always be 100% accurate.