- Environmental science textbook
- "Environmental Threats." Alpine Tundra. N.p., n.d. Web. 21 Oct. 2016.
- "Alpine Tundra." Alpine Tundra. N.p., n.d. Web. 21 Oct. 2016.
- " ." Blue Planet Biomes. N.p., n.d. Web. 21 Oct. 2016.
- "Alpine - Infogram, Charts & Infographics." Alpine - Infogram, Charts & Infographics. N.p., n.d. Web. 21 Oct. 2016.
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