An edited book is a collection of articles or chapters written by different authors usually on the same subject.
Note: if there is only one editor, use (ed.) after the name. If there are multiple editors, use (eds) after their names.
(Collard & Reynolds 2005).
Collard, J. & Reynolds, C. (eds.) (2005). Leadership, gender and culture in education: male and female perspectives. Buckingham: Open University Press.