Chicago: "The Language-Families of Africa," The Language-Families of Africa in Primitive Behavior: An Introduction to the Social Sciences, ed. Thomas, William I. (New York: McGraw-Hill Book Company, Inc., 1937), Original Sources, accessed September 18, 2024, http://www.originalsources.com/Document.aspx?DocID=4UG6ZGUP3ZX7C4E.
MLA: . "The Language-Families of Africa." The Language-Families of Africa, in Primitive Behavior: An Introduction to the Social Sciences, edited by Thomas, William I., New York, McGraw-Hill Book Company, Inc., 1937, Original Sources. 18 Sep. 2024. http://www.originalsources.com/Document.aspx?DocID=4UG6ZGUP3ZX7C4E.
Harvard: , 'The Language-Families of Africa' in The Language-Families of Africa. cited in 1937, Primitive Behavior: An Introduction to the Social Sciences, ed. , McGraw-Hill Book Company, Inc., New York. Original Sources, retrieved 18 September 2024, from http://www.originalsources.com/Document.aspx?DocID=4UG6ZGUP3ZX7C4E.