Chicago: Bureau of the Census, "Base Year: 1921," A Historical Record of the Population of the United States [From 1630 to 1991], ed. Stevens, Bertram, 1872 - and trans. Hapgood, Isabel Florence, 1850-1928 in A Historical Record of the Population of the United States [From 1630 to 1991] (London: Effingham Wilson, Royal Exchange, 1920), Original Sources, accessed March 20, 2023, http://www.originalsources.com/Document.aspx?DocID=49WNQN8DST36Q76.
MLA: Bureau of the Census. "Base Year: 1921." A Historical Record of the Population of the United States [From 1630 to 1991], edited by Stevens, Bertram, 1872 -, and translated by Hapgood, Isabel Florence, 1850-1928, in A Historical Record of the Population of the United States [From 1630 to 1991], London, Effingham Wilson, Royal Exchange, 1920, Original Sources. 20 Mar. 2023. http://www.originalsources.com/Document.aspx?DocID=49WNQN8DST36Q76.
Harvard: Bureau of the Census, 'Base Year: 1921' in A Historical Record of the Population of the United States [From 1630 to 1991], ed. and trans. . cited in 1920, A Historical Record of the Population of the United States [From 1630 to 1991], Effingham Wilson, Royal Exchange, London. Original Sources, retrieved 20 March 2023, from http://www.originalsources.com/Document.aspx?DocID=49WNQN8DST36Q76.