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 January 14, 2025, http://originalsources.com/Document.aspx?DocID=AI9LW2Y7UFQ6N76.
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. 14 Jan. 2025. http://originalsources.com/Document.aspx?DocID=AI9LW2Y7UFQ6N76.
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 14 January 2025, from http://originalsources.com/Document.aspx?DocID=AI9LW2Y7UFQ6N76.