His The seventh level, 1979: t.p. (William Nicholson) blurb (BBC director & producer)

Internet movie database, Oct. 7, 2002 (b. around 1948 in the United Kingdom; screenwriter and producer of BBC documentaries) February 8, 2017 (William Nicholson; born William Benedict Nicholson in 1948 in England; editor, screenwriter, producer, and director; variant names: Bill Nicholson, William Francis Nicholson)

Franzoni, David. Gladiator: [screenplay], 2000: t.p. (Bill Nicholson)

Contemporary authors, via Gale literature resource center WWW site, June 22, 2020 (William Nicholson; born January 12, 1948 in England; author of novels including both adult novels and fantasy novels for children, as well as plays, screenplays, and teleplays)

Authors & writers WW, 1972; Contemp. authors, v. 1-84; Writers dir., 1976-78; Contemp. novelists, 1976; Internat'l telev. almanac, 1972-73; Kemps film & telev. yrbk. internat'l, 1977/78