Following APA (American Psychological Association) citation the correct in-text citation will be:
--> (Daniels & Greene, 2005, p.15) (Last name author A & Last name author B, year, page)
and the reference will be:
--> Daniels, G. & Greene, M. (2005). <em>Twain’s Boyhood and His Fiction (L. </em>Masters, Ed.). New York, The United States: Scribner.
Author, A. & Author B. (Year of publication). Title of book in sentence case and italics (A. Editor & B. Editor, Eds.). Location: Publisher.