Berzins, A. (1967). The two faces of co-existence. R. Speller.
Cita Chicago (17th ed.)Berzins, Alfreds. The Two Faces of Co-existence. New York: R. Speller, 1967.
Cita MLA (9th ed.)Berzins, Alfreds. The Two Faces of Co-existence. R. Speller, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.