LC database, Feb 11, 2003 (hdg.: Petri, Olavus, 1493-1552; usage: Olavus Petri, Olauus Petri Phase, Olai Petri)
LIBRIS online search, Feb. 11, 2003 (Olauus Petri; Olaus Petri; Olavus Petri; Olavus Petri (Phase); Olof Petersson; Mäster Olof; 1493-1552)
nuc90-61779: Author's En liten postilla [MI] 1537 (hdg. on GmC rept.: Petri, Olavus, 1493-1552)
Olavus Petris reformatoriska åskådning, 1964.
Tuomarinohjeet 1545, 2001 t.p. (Olavus Petri) p. 7, etc. (Olaus Petri; Olavus Petri (Phase); registered as Paulus [sic] Phase de Svezia in Leipzig University in 1516)