"New York, Southern District Naturalization Index, 1917-1950," index, FamilySearch (
https://familysearch.org/pal:/MM9.1.1/XG83-GP5 : accessed 17 February 2015), 1917-1950; from "Alphabetical Index to Declarations of Intention of the U.S. District Court for the Southern District of New York, 1917-1950," Fold3.com; citing NARA microfilm publication M1675, roll 52, National Archives and Records Administration, Washington, D.C.