GULTHIE, M. J. (1961). Zology. John Wiley & Sons Inc.
Lua i Stíl Chicago (17ú heag.)GULTHIE, Marry J. Zology. John Wiley & Sons Inc, 1961.
Lua MLA (8ú heag.)GULTHIE, Marry J. Zology. John Wiley & Sons Inc, 1961.
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