The Bulgarian Americans
by Claudia Carlson (Chelsea House, out of print)
Peter Menikoff: The Story of a Bulgarian Boy in the Great American Melting Pot
by Peter Dimitrov Yankoff (Cokesbury Press, out of print), partially fictionalized account of Bulgarian-American immigrant life.
Under the Yoke
by Ivan Vazov (Twayne Publishers, out of print), tells the story of the 1876 uprising; one of the first Bulgarian novels.