Penguin Books. (1945). Ten Years of Penguins: 1935-1945. Penguin Books.
Lua i Stíl Chicago (17ú heag.)Penguin Books. Ten Years of Penguins: 1935-1945. Harmondsworth [u.a.]: Penguin Books, 1945.
Lua MLA (8ú heag.)Penguin Books. Ten Years of Penguins: 1935-1945. Penguin Books, 1945.
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