Polish Research Centre. (1944). The bridgehead of East Prussia. Edinburgh: Polish Books Depot.
Cita Chicago (17th ed.)Polish Research Centre. The Bridgehead of East Prussia. Edinburgh: Polish Books Depot, 1944.
Cita MLA (8th ed.)Polish Research Centre. The Bridgehead of East Prussia. Edinburgh: Polish Books Depot, 1944.
Atenció: Aquestes cites poden no estar 100% correctes.