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MLA
“INTRODUCTION.” Peril in the Ponds: Deformed Frogs, Politics, and a Biologist's Quest, by JUDY HELGEN, University of Massachusetts Press, Amherst; Boston, 2012, pp. 1–6, www.jstor.org/stable/j.ctt5vk62t.4. Accessed 10 Apr. 2021.
APA
HELGEN, J. (2012). INTRODUCTION. In Peril in the Ponds: Deformed Frogs, Politics, and a Biologist's Quest (pp. 1-6). Amherst; Boston: University of Massachusetts Press. Retrieved April 10, 2021, from http://www.jstor.org/stable/j.ctt5vk62t.4
CHICAGO
HELGEN, JUDY. "INTRODUCTION." In Peril in the Ponds: Deformed Frogs, Politics, and a Biologist's Quest, 1-6. Amherst; Boston: University of Massachusetts Press, 2012. Accessed April 10, 2021. http://www.jstor.org/stable/j.ctt5vk62t.4.

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