Jesù bambino, c1993 caption (Frederick H. Martens)
LC data base, 2-18-97 (hdg.: Martens, Frederick Herman, 1874-1932; usage: Frederick H. Martens)
New Grove dict. of Amer. mus. (Martens, Frederick Herman; b. July 6, 1874, New York, d. Dec. 18, 1932, Mountain Lakes, NJ; librettist and writer on music)