PWS-4 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "PWS-4" in English language version.

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archive.org

Cynk, Jerzy B (1971). Polish aircraft 1893-1939. Putnam. pp. 391–392. ISBN 0-370-00085-4.

worldcat.org

Glass, Andrzej (1977). Polskie konstrukcje lotnicze 1893–1939 [Polish aviation designs 1893–1939] (in Polish). Warsaw: WKiŁ. p. 180. OCLC 213774512.