Lua APA (7ú heag.)

WEILL ANN. (2019). THE WORLD'S MOST AMAZING NATIONAL PARKS (2018 Ed.). RAINTREE PUBLISHERS.

Lua i Stíl Chicago (17ú heag.)

WEILL ANN. THE WORLD'S MOST AMAZING NATIONAL PARKS. 2018 Ed. CHICAGO: RAINTREE PUBLISHERS, 2019.

Lua MLA (9ú heag.)

WEILL ANN. THE WORLD'S MOST AMAZING NATIONAL PARKS. 2018 Ed. RAINTREE PUBLISHERS, 2019.

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