Kerrod, R. (1974). Concise Encyclopedia of Science. Purnell & Sons.
Lua i Stíl Chicago (17ú heag.)Kerrod, Robin. Concise Encyclopedia of Science. Purnell & Sons, 1974.
Lua MLA (8ú heag.)Kerrod, Robin. Concise Encyclopedia of Science. Purnell & Sons, 1974.
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