APA Style

Joseph, S. et al (1997). Understanding Post-traumatic Stress : A Psychosocial Perspective On PTSD and Treatment . Chichester: John Wiley & Sons.

MLA Style

Joseph, Stephen. et al. "Understanding Post-traumatic Stress : A Psychosocial Perspective On PTSD and Treatment". Chichester: John Wiley & Sons, 1997. E-Book.