Bates, H. E The Modem Short Story, Writer, Inc., 1941,231 p Bates surveys the development of short stories in America, France, Russia, and Great Britain from the writers of Edgar Allan Poe's day through the 1940s and explains why O Henry's short stones are so successful

Current-Garcia, Eugene. O Henry (William Sydney Porter), Twayne Publishers, Inc., 1965.

This thorough biographical and critical study includes an examination of how O. Henry's regional background influenced his work

Current-Garcia, Eugene, editor O. Henry. A Study of the Short Fiction, Twayne, 1993, 256 p.

This volume presents Current-Garcia's analyses of the stories of O Henry and collects articles by various other critics

Ecldey, Wilton "The Gift of the Magi," in Reference Guide to Short Fiction, St James Press, 1994, pp. 716-17. After a very short introduction about the writer, Ecldey provides a brief general overview of plot and technique in "The Gift of the Magi...