“Barriers to Movement.” Human Biogeography, by Alexander H. Harcourt, 1st ed., University of California Press, Berkeley; Los Angeles; London, 2012, pp. 77–86, www.jstor.org/stable/10.1525/j.ctt1pnfg9.7. Accessed 10 Apr. 2021.
Harcourt, A. (2012). Barriers to Movement. In Human Biogeography (pp. 77-86). Berkeley; Los Angeles; London: University of California Press. Retrieved April 10, 2021, from http://www.jstor.org/stable/10.1525/j.ctt1pnfg9.7
Harcourt, Alexander H. "Barriers to Movement." In Human Biogeography, 77-86. Berkeley; Los Angeles; London: University of California Press, 2012. Accessed April 10, 2021. http://www.jstor.org/stable/10.1525/j.ctt1pnfg9.7.
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