Book with single editor [from Print source using APA 6th ed.]
Referencing a whole edited book is uncommon. You are more likely to be referencing individual chapters. Even an introduction may be treated as a chapter. See the page for referencing chapters in an edited book.
Don't panic if you see several dates inside the book. The date you need to use is the one which matches the edition of the book that you're using. Ignore any dates that are just listed as reprints or impressions. Look on the book cover and see if it says e.g. Fourth edition (it should also say this on the title page inside the book). In this case all that you need to show in your reference in the bibliography/reference list is the date for the 4th edition of the book (and also give the edition after the book title). Search for the book on the library catalogue to check the details needed for the reference if you are unsure.
Editor, Initials (Ed.). (year). Title of book. Place of publication: Publisher.
Joseph, P. E. (Ed.). (2006). The black power movement: Rethinking the civil rights-black power era. New York: Routledge.
Koutrakou, V. N. (Ed.). (2004). Contemporary issues and debates in EU policy. Manchester: Manchester University Press.
Maher, B. A. (Ed.). (1964-1972). Progress in experimental personality research (6 vols.). New York: Academic Press.
Citation in Text
It is debatable to what extent the black power movement (Joseph, 2006, p. 15) has had an effect on ....
There is no doubt that since the Treaty of Rome (Koutrakou, 2004, pp. 23-24), France has ...