APA (7th ed.) Citation

Brown, S. I., & Walter, M. I. (2009). The Art of problem posing (2. ed., transferred to digital print.). Routledge.

Chicago Style (17th ed.) Citation

Brown, Stephen I., and Marion I. Walter. The Art of Problem Posing. 2. ed., transferred to digital print. New York [u.a.]: Routledge, 2009.

MLA (9th ed.) Citation

Brown, Stephen I., and Marion I. Walter. The Art of Problem Posing. 2. ed., transferred to digital print. Routledge, 2009.