MLA

Siekanowicz, Peter, and Vladimir Gsovski. Legal Sources and Bibliography of Poland. New York: Published for Free Europe Committee, Inc., by F. A. Praeger, 1964.

APA

Siekanowicz, P., & Gsovski, V. (1964). Legal sources and bibliography of Poland. New York: Published for Free Europe Committee, Inc., by F. A. Praeger.

Chicago

Siekanowicz, Peter, and Vladimir Gsovski. Legal Sources and Bibliography of Poland. New York: Published for Free Europe Committee, Inc., by F. A. Praeger, 1964.