Kroeger, Karl (Personal Name)
His Four preludes, c1980: t.p. (Karl Kroeger)
Rehrig, W.H. The heritage ency. of band music, c1991 (Kroeger, Karl; b. 4-4-32, Louisville, Ky.)
Kroeger, K. The Worcester collection of sacred harmony and sacred music in America, 1786-1803, 1976: t.p. (Karl Douglas Kroeger) p. iii (b. April 13, 1932, Louisville, Ky.)
Oxford music online, March 27, 2017: New Grove dictionary of American music, 2nd ed. (Kroeger, Karl; born April 13, 1932, Louisville, Kentucky; American musicologist, music editor, composer, and bibliographer)