Campbell, N. A. (2021). Biology: A global approach (12th.). Pearson Education Limited.
Lua i Stíl Chicago (17ú heag.)Campbell, Neil A. Biology: A Global Approach. 12th. Harlow, Essex, England: Pearson Education Limited, 2021.
Lua MLA (9ú heag.)Campbell, Neil A. Biology: A Global Approach. 12th. Pearson Education Limited, 2021.
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