BBC: If...: Review and photos.
British Film Institute: If....: Cast list, synopsis, and photos. Malcolm McDowell's comments on the film.
Britmovie: If...: Cast list, production list and synopsis.
If.... (1968): Fan site with cast list, quotes, pictures, quotations, and a detailed synopsis of the film.
IMDb: If...: Synopsis, cast and crew, awards, trivia, promotional information, and links.