found: Studia z historii filozofii, 1980:t.p. (ks. prof. Pawła Siwka) p. 7 (b. Jan. 21, 1893)
found: LC data base, 4-3-87(hdg.: Siwek, Paul; usage: Paul Siwek)
found: National Library of Polans Web OPAC, Aug. 5, 2008(Siwek, Paweł (1893-1986))
found: Aristotelis Parva naturalia : graece et latine, 1963:title page (edidit, versione auxit, notis illustravit Paulus Siwek S.J., Pontificiae Universitatis Lateranensis professor)
found: Catholicauthors.com, WWW site, viewed March 7, 2018(Reverend Paul Siwak S.J.; born in Poland; emigrated to the United States; Ph.D. from Gregorian University in Rome and the Sorbonne; philosophy, metaphysical psychology, experimental psychology; interests: metaphysical psychology; body and soul; Aristotle; Spinoza; stigmatism; philosophy of evil)