Twentieth century crime and mystery writers, c1980 (Ludlum, Robert; b. 5-25-27; also writes as Jonathan Ryder, Michael Shepherd)
Doroga v Gandolʹfo, 1995 t.p. (Robert Ladlėm)
Washington post, Mar 13, 2001 (Robert Ludlum, suspense novelist, d. Mar. 12, 2001)
Sabrina fair, 1956 DLC copy theater program, Olney Theatre production (Robert Ludlum; first student to graduate from Wesleyan University as a drama major)
Internet Broadway database, Jan. 13, 2010 (Robert Ludlum; Male; Performer; performances listed in the 1950’s)
Wikipedia, Jan. 13, 2010 (Robert Ludlum (May 25, 1927- March 12, 2001) was an American author of 25 thriller novels; prior to becoming an author, he had been a theatrical actor and producer)
