Note 3:

See Miriam King and Samuel Preston, "Who Lives with Whom?: Individual Versus Houshehold Measures," Journal of Family History, 15 (1990): 117-132; Steven Ruggles, Prolonged Connections: The Rise of the Extended Family in Nineteenth-Century England and America, 1987; Ruggles, "The Transformation of American Family Structure," American Historical Review, 99 (1994): 103-128; and Ruggles, "The Origins of African-American Family Structure," American Sociological Review, 59 (1994): 136-151.