You can use the appropriate citation option from below to add a reference to this page.
"A21." Fullformexpand.com, https://www.fullformexpand.com/a21/756646. Accessed 16 Feb. 2026.
Fullformexpand.com, 2026. "A21." Accessed February 16, 2026. https://www.fullformexpand.com/a21/756646.
"A21." (n.d.). Fullformexpand.com. Retrieved February 16, 2026, from https://www.fullformexpand.com/a21/756646.
A21. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/a21/756646 (Accessed: 16 February 2026).