Barnes, dive, Review, in New York Times, November 13, 1970, p. 25

Berkowitz, Gerald M,, "Anthony Shaffer. Overview," in Contemporary Dramatists, 5th ed, edited by K A Berney, St. James Press, 1993

Carlson, Marvin, Deathtraps, Indiana University Press, 1993.

"Murderous Games, The S elf-Conscious Art of the Comedy Thriller," in Bucknell Review, Vol. 39, No 2,1996, pp. 170-183

Gillen, Francis, "Anthony Shaffer," in Dictionary of Literary Biography, Volume 13 British Dramatists since World War II, edited by Stanley Wemtraub, Gale Research, 1982, pp 445-450.

Glenn, Jules, "Twins m Disguise A Psychoanalytic Essay on Sleuth and The Royal Hunt of the Sun," in Psychoanalytic Quarterly, April 1974, pp 288-302.

Gow, Gordon, "Murder Games," m Plays and Players, October 1979, pp. 10-13

Grossvogel, David, Death Deferred The Long Life, Splendid Afterlife, andMysterious Workings of Agatha Christie, Johns Hopkins University Press, 1979.

Gussow, Mel, "With 'Sleuth' Another Shaffer Catches Public Eye," in New York Times, November 18,1970, p, 38.

Heilbrun, Carolyn G , "The Detective Novel...