Lua APA (7ú heag.)

Nagel, R. (2004). UXL encyclopedia of landforms and other geologic features. UXL.

Lua i Stíl Chicago (17ú heag.)

Nagel, Rob. UXL Encyclopedia of Landforms and Other Geologic Features. Detroit: UXL, 2004.

Lua MLA (9ú heag.)

Nagel, Rob. UXL Encyclopedia of Landforms and Other Geologic Features. UXL, 2004.

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