United States. Army. Camp Pena Colorado (Tex.) & United States. National Archives and Records Service. (1974). Camp Pena Colorado, Texas: Letters sent, registers of letters received, endorsements, letters received. National Archives and Records Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)United States. Army. Camp Pena Colorado (Tex.) και United States. National Archives and Records Service. Camp Pena Colorado, Texas: Letters Sent, Registers of Letters Received, Endorsements, Letters Received. Washington: National Archives and Records Service, 1974.
Παραπομπή σε μορφή MLA (8th εκδ.)United States. Army. Camp Pena Colorado (Tex.) και United States. National Archives and Records Service. Camp Pena Colorado, Texas: Letters Sent, Registers of Letters Received, Endorsements, Letters Received. National Archives and Records Service, 1974.