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"OPEK." Fullformexpand.com, https://www.fullformexpand.com/opek/908582. Accessed 10 Jan. 2026.
Fullformexpand.com, 2026. "OPEK." Accessed January 10, 2026. https://www.fullformexpand.com/opek/908582.
"OPEK." (n.d.). Fullformexpand.com. Retrieved January 10, 2026, from https://www.fullformexpand.com/opek/908582.
OPEK. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/opek/908582 (Accessed: 10 January 2026).