WORLD BOOK, I. (1987). THE PLANT WORLD. WORLD BOOK INC.
Lua i Stíl Chicago (17ú heag.)WORLD BOOK, INC. THE PLANT WORLD. CHICAGO: WORLD BOOK INC, 1987.
Lua MLA (9ú heag.)WORLD BOOK, INC. THE PLANT WORLD. WORLD BOOK INC, 1987.
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