Ancestry.com. U.S., Registers of Deaths of Volunteers, 1861-1865 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2012.

Original data:
Registers of Deaths of Volunteers, compiled 1861–1865. ARC ID: 656639. Records of the Adjutant General's Office, 1780's–1917. Record Group 94. National Archives at Washington, D.C.