Tolong jelaskan mengenai Rujukan dari Stephen Foster

Emerson, Ken (1998). Doo Dah! Stephen Foster and the Rise of American Popular Culture. De Capo Press. ISBN 0-306-80852-8.

Charles Hamm (1979). Yesterdays: Popular Song in America (Chapter 10, "Old Folks at Home, or, the Songs of Stephen Foster"). W. W. Norton & Company. ISBN 0-393-01257-3.