Jablonski 1987, pp. 24: "Morris Gershovitz moved his family...to Brooklyn, where he had found an unprepossessing two-story brick house at 242 Snedicker Avenue... In this house on September 26, 1898, Jacob Gershwine (as George's birth certificate reads) was delivered...The name change may have been Morris's idea; it is possible that by the time he married he had streamlined his name to "Gershvin," and so would the doctor have been informed. Gershwine in a Jewish community would still be pronounced Gershvin. Jablonski, Edward (1987). Gershwin. Doubleday. ISBN0-385-19431-5.
Pollack 2006, pp. fn707: "Gershwin's birth certificate reads, 'Jacob Gershwine'; [Frances Gershwin] suggests that Morris's brother, Aaron, first changed the family name, though the latter gave his name in the 1920 census as 'Gershvin.'" Pollack, Howard (2006). George Gershwin. His Life and Work. University of California Press. ISBN978-0-520-24864-9.
Jablonski 1987, pp. 25: "Eight-year old George (no one in the family remembers calling him Jake or Jacob)..." Jablonski, Edward (1987). Gershwin. Doubleday. ISBN0-385-19431-5.
