Dent, J. M. (1958). Everyman's encyclopedia. Volume V. J. M. Dent & Sons Ltd.
Lua i Stíl Chicago (17ú heag.)Dent, J. M. Everyman's Encyclopedia. Volume V. J. M. Dent & Sons Ltd, 1958.
Lua MLA (8ú heag.)Dent, J. M. Everyman's Encyclopedia. Volume V. J. M. Dent & Sons Ltd, 1958.
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