Incorporated, G. (2000). The New book of knowledge: V. 21.: Index. Grolier Inc.
Lua i Stíl Chicago (17ú heag.)Incorporated, Grolier. The New Book of Knowledge: V. 21.: Index. Grolier Inc, 2000.
Lua MLA (8ú heag.)Incorporated, Grolier. The New Book of Knowledge: V. 21.: Index. Grolier Inc, 2000.
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