Cita APA (7a ed.)

Hadfield, S., & Hasson, G. (2010). How to be assertive in any situation (1st edition.). Prentice Hall Life.

Cita Chicago Style (17a ed.)

Hadfield, Sue, y Gill Hasson. How to Be Assertive in Any Situation. 1st edition. Harlow: Prentice Hall Life, 2010.

Cita MLA (9a ed.)

Hadfield, Sue, y Gill Hasson. How to Be Assertive in Any Situation. 1st edition. Prentice Hall Life, 2010.