Valtin, J., & Krebs, R. J. H. (1941). Out of the night. New York: Alliance Book Corporation.
Lua i Stíl Chicago (17ú heag.)Valtin, Jan, agus Richard Julius Hermann Krebs. Out of the Night. New York: Alliance Book Corporation, 1941.
Lua MLA (8ú heag.)Valtin, Jan, agus Richard Julius Hermann Krebs. Out of the Night. New York: Alliance Book Corporation, 1941.
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