Musiche in tavolatura organistica tedesca della Biblioteca Nazionale di Torino, 1970---(Valentin Trexell)
The New Grove Dictionary of Music and Musicians, Macmillan, 2001---(Dreztel [Dreztl, Tretzel, Drechsel, Trechsel]; german family of musicians; (1) Valentin Dretzel (ii); b. Nuremberg, bap. 30 May 1578; Nuremberg, bur. 23 March 1658; composer, organist and instrumentalist)