"United States Census, 1910," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M2Y2-XCG : accessed 27 Sep 2014), Margaret A Knapp in household of Charles L Knapp, Kansas Ward 14, Jackson, Missouri, United States; citing enumeration district (ED) 201, sheet 17A, family 118, NARA microfilm publication T624, FHL microfilm 1374803.