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Morton, Donald. “Nonfiction Reading Test: Koko.” Ereading Worksheets. http://www.ereadingworksheets.com/reading-comprehension-worksheets/nonfiction-reading-test-koko.htm.
Morton, Donald. “Nonfiction Reading Test: TV.” Ereading Worksheets. http://www.ereadingworksheets.com/reading-comprehension-worksheets/nonfiction-reading-test-tv.htm.
Wikipedia. “Koko (gorilla).” Accessed May 1, 2015. https://en.wikipedia.org/wiki/Koko_%28gorilla%29.