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"QEN." Fullformexpand.com, https://www.fullformexpand.com/qen/461074. Accessed 3 Dec. 2025.
Fullformexpand.com, 2025. "QEN." Accessed December 3, 2025. https://www.fullformexpand.com/qen/461074.
"QEN." (n.d.). Fullformexpand.com. Retrieved December 3, 2025, from https://www.fullformexpand.com/qen/461074.
QEN. (2025). Fullformexpand.com. Available at: https://www.fullformexpand.com/qen/461074 (Accessed: 3 December 2025).