Fullformexpand.com, 2026. "GABRIEL." Accessed April 24, 2026. https://www.fullformexpand.com/gabriel/gateway-and-bridge-to-europes-national-libraries.
"GABRIEL." (n.d.). Fullformexpand.com. Retrieved April 24, 2026, from https://www.fullformexpand.com/gabriel/gateway-and-bridge-to-europes-national-libraries.
GABRIEL. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/gabriel/gateway-and-bridge-to-europes-national-libraries (Accessed: 24 April 2026).