Cita APA (7th ed.)

Essa, E. (2007). What to do when: Practical guidance strategies for challenging behaviors (6th ed.). Thomson/Delmar Learning.

Cita Chicago (17th ed.)

Essa, Eva. What to Do When: Practical Guidance Strategies for Challenging Behaviors. 6th ed. Clifton Park, N.Y: Thomson/Delmar Learning, 2007.

Cita MLA (9th ed.)

Essa, Eva. What to Do When: Practical Guidance Strategies for Challenging Behaviors. 6th ed. Thomson/Delmar Learning, 2007.