BBC News: It Takes All Sorts - 1977 letter from Alistair Cooke in which he remembers his old friends Groucho Marx and Bing Crosby.
Bing Crosby Collection - Details on the memorabilia at his alma mater, Gonzaga University.
Crosby Family Genealogy - Prepared by the singer's brother, and tracing the family back to the 13th century.
Jerry Jazz Musician: Bing Crosby - Interview with Gary Giddins, author of Bing Crosby: A Pocketful of Dreams. Includes discussion of Crosby and Louis Armstrong, and recommended recordings.