APA (7th ed.) Citation

Heijkoop, J., & Clegg, J. (2012). Introduction to the Heijkoop approach to challenging behaviour in ID.

Chicago Style (17th ed.) Citation

Heijkoop, Jacques, and Jennifer Clegg. Introduction to the Heijkoop Approach to Challenging Behaviour in ID. 2012.

MLA (9th ed.) Citation

Heijkoop, Jacques, and Jennifer Clegg. Introduction to the Heijkoop Approach to Challenging Behaviour in ID. 2012.

Warning: These citations may not always be 100% accurate.