Find a Grave, database and images (https://www.findagrave.com/memorial/3416448/ira-lester-mather: accessed ), memorial page for Ira Lester Mather (19 Sep 1872–25 Jan 1947), Find a Grave Memorial ID 3416448, citing Fort Rosecrans National Cemetery, San Diego, San Diego County, California, USA; Maintained by Cherie Valentine (contributor 46809961).
Ancestry.com. U.S., National Cemetery Interment Control Forms, 1928-1962 [database on-line]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2012. Interment Control Forms, 1928–1962. Interment Control Forms, A1 2110-B. NAID: 5833879. Record Group 92, Records of the Office of the Quartermaster General, 1774–1985. The National Archives at St. Louis, St. Louis, MO.