(TRM), Department of Veterans Affairs (VA), Office of Information &Technology (OI&T), Product Development (PD), Technical Reference Model. "Cosign Digital Signature". 11 Aralık 2014 tarihinde kaynağından arşivlendi.
(TRM), Department of Veterans Affairs (VA), Office of Information &Technology (OI&T), Product Development (PD), Technical Reference Model. "Cosign Digital Signature". 11 Aralık 2014 tarihinde kaynağından arşivlendi.