PARKER, T. J. A text book of zoology. Macmillan & Co Ltd.
Lua i Stíl Chicago (17ú heag.)PARKER, T. Jeffery. A Text Book of Zoology. Macmillan & Co Ltd.
Lua MLA (8ú heag.)PARKER, T. Jeffery. A Text Book of Zoology. Macmillan & Co Ltd.
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