found: Scacchi, M. Cribrum musicum ad triticum Siferticum [MF] 1643:t.p. (Paulus Sifertus, dantiscanus)
found: MGG(Siefert (Syfert, Sivert, Sibert), Paul, baptized Danzig May 23, 1586, died Danzig May 6, 1666; composer and theorist)
found: New Grove (Siefert (Syfert, Sivert, Sibert), Paul)
found: New Grove dict. mus., 2nd ed. WWW site, Aug. 06, 2001(Siefert [Syfert, Sivert, Sibert], Paul; bap. Danzig [now Gdansk], 23 May 1586; d. Danzig, 6 May 1666)
found: The Anders von Düben tablature, 2000:p. xix (Paul Sibern)