Among the titles that Kubrick considered for the film were "Dr. Doomsday or: How to Start World War III Without Even Trying", "Dr. Strangelove's Secret Uses of Uranus", and "Wonderful Bomb". After deciding to make the film a black comedy, Kubrick brought in Terry Southern as a co-writer in late 1962. The choice was influenced by reading Southern's comic novel "The Magic Christian", which Kubrick had received as a gift from Peter Sellers, and which itself became a Sellers film in 1969. Southern made important contributions to the film, but his role led to a rift between Kubrick and Peter George; after "Life" magazine published a photo-essay on Southern in August 1964 which implied that Southern had been the script's principal author—a misperception neither Kubrick nor Southern did much to dispel—Peter George wrote an indignant letter to the magazine, published in its September 1964 issue, in which he pointed out that he had both written the film's source novel and collaborated on various incarnations of the script over a period of ten months, whereas "Southern was briefly employed ... to do some additional rewriting for Kubrick and myself and fittingly received a screenplay credit in behind Mr. Kubrick and myself".