APA (7th ed.) Citation

Langrehr, J., & Langrehr, J. (2008). Tricky thinking problems: Advanced activities in applied thinking skills for ages 6 - 11. Routledge.

Chicago Style (17th ed.) Citation

Langrehr, John, and Jan Langrehr. Tricky Thinking Problems: Advanced Activities in Applied Thinking Skills for Ages 6 - 11. London [u.a.]: Routledge, 2008.

MLA (9th ed.) Citation

Langrehr, John, and Jan Langrehr. Tricky Thinking Problems: Advanced Activities in Applied Thinking Skills for Ages 6 - 11. Routledge, 2008.