Y. Rehman, “Difference between Quantitative and Qualitative Research Question- PICO vs. SPIDER”, ASRJETS-Journal, vol. 77, no. 1, pp. 188–199, Mar. 2021, Accessed: Nov. 29, 2025. [Online]. Available: https://asrjetsjournal.org/American_Scientific_Journal/article/view/6730