Engels, F. (1954). Dialectics of nature. Progress Pub.
Lua i Stíl Chicago (17ú heag.)Engels, Friedrich. Dialectics of Nature. Moscow: Progress Pub, 1954.
Lua MLA (9ú heag.)Engels, Friedrich. Dialectics of Nature. Progress Pub, 1954.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.