APA (7th ed.) Citation

Butler, D. R. (2009). The changing alpine treeline: The example of Glacier National Park, MT, USA. Elsevier.

Chicago Style (17th ed.) Citation

Butler, David R. The Changing Alpine Treeline: The Example of Glacier National Park, MT, USA. Amsterdam ; Boston: Elsevier, 2009.

MLA (9th ed.) Citation

Butler, David R. The Changing Alpine Treeline: The Example of Glacier National Park, MT, USA. Elsevier, 2009.