Gershwin, George, "If I Knew You Better," "To Know You," 2nd piano parts [printed and handwritten], Box: 1, Folder: A: 50. Louis and Henry Manners Katzman collection, MS 156. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/416020 Accessed May 11, 2024.