Gregory, P. Romantic guitar music [SR] p1986 container (Franz Abt)
MGG (Abt, Franz; b. 12/22/1819; d. 3/31/1885)
His At darksome night, c1867 t.p. (Franz Abt) caption (F. Abt)
German Wikipedia, Nov. 14, 2007 (Franz Abt; Franz Wilhelm Abt)
Grove Music Online, January 16, 2014 (Abt, Franz Wilhelm; born Dec. 22, 1819, Eilenburg; died March 31, 1885, Wiesbaden; German composer, also active as a choir and opera conductor)