APA (7th ed.) Citation

Gumkowski, J., & Leszczynski, K. V. (1961). Poland under Nazi occupation. Polonia Publ. House.

Chicago Style (17th ed.) Citation

Gumkowski, Janusz, and Kazimierz Verfasser Leszczynski. Poland Under Nazi Occupation. Warsaw: Polonia Publ. House, 1961.

MLA (8th ed.) Citation

Gumkowski, Janusz, and Kazimierz Verfasser Leszczynski. Poland Under Nazi Occupation. Polonia Publ. House, 1961.