About.com: Interview with Donald O'Conner: Article about the actors role in the film "Singing in the Rain".
Donald O'Connor Fan Club: Unofficial site with pictures, filmography, and reviews.
Donald O'Connor Web Site: Fan site with biography, photos, filmography, discography, listings of television and theatre appearances, and memorabilia museum.
IMDb: Donald O'Connor: Filmography, with television appearances.