found: His Anleitung zur Improvisation für Trompete, 1968: t.p. (Dusko Goykovich) p. 3 (b. Jajce, Yugoslavia, 10-14-1931)
found: Wikipedia, May 4, 2011 (Duško Gojković (Serbian Cyrillic: Душко Гојковић); b. Oct. 14, 1931, Jajce, Yugoslavia; Serbian jazz trumpeter and composer)
found: Grove music online, May 4, 2011 (Goykovich, Dusko (Gojkovic, Dusan); b. Oct. 14, 1931, Jajce, Yugoslavia; Yugoslav trumpeter and flugelhorn player)
found: Feather, Leonard. Biographical encyclopedia of jazz, 1999 (Goykovich, Dusko (Dusan Gojkovic); trumpet player, composer; b. Oct. 14, 1931, Jajce)
found: New Grove dictionary of jazz (Goykovich, Dusko (Gojkovic, Dusan; b. Oct. 14, 1931, Yusoslavia; Yugoslav trumpeter and flugelhorn player)
Goykovich, Dusko, 1931-
