Lua APA (7ú heag.)

SAH, S. (2008). 101 FACTS NATURAL WORLD. PEARSON EDUCATION.

Lua i Stíl Chicago (17ú heag.)

SAH, SNIGDHA. 101 FACTS NATURAL WORLD. NEW DELHI: PEARSON EDUCATION, 2008.

Lua MLA (9ú heag.)

SAH, SNIGDHA. 101 FACTS NATURAL WORLD. PEARSON EDUCATION, 2008.

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