Huxley, J. (1937). Essays in popular science. London: Penguin Books.
Lua i Stíl Chicago (17ú heag.)Huxley, Julian. Essays in Popular Science. London: Penguin Books, 1937.
Lua MLA (8ú heag.)Huxley, Julian. Essays in Popular Science. London: Penguin Books, 1937.
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