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"OPID." Fullformexpand.com, https://www.fullformexpand.com/opid/operator-identification. Accessed 9 Apr. 2026.
Fullformexpand.com, 2026. "OPID." Accessed April 9, 2026. https://www.fullformexpand.com/opid/operator-identification.
"OPID." (n.d.). Fullformexpand.com. Retrieved April 9, 2026, from https://www.fullformexpand.com/opid/operator-identification.
OPID. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/opid/operator-identification (Accessed: 9 April 2026).