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"STPI." Fullformexpand.com, https://www.fullformexpand.com/stpi/service-tax-performance-index. Accessed 19 Feb. 2026.
Fullformexpand.com, 2026. "STPI." Accessed February 19, 2026. https://www.fullformexpand.com/stpi/service-tax-performance-index.
"STPI." (n.d.). Fullformexpand.com. Retrieved February 19, 2026, from https://www.fullformexpand.com/stpi/service-tax-performance-index.
STPI. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/stpi/service-tax-performance-index (Accessed: 19 February 2026).