Sari, R., A. M. Rifa’i, M. S. Ahsan, M. R. Pahlevi, and M. I. Arief. “The Systematic Literature Review of the Spiral Development Model: Topics, Trends, and Application Areas”. International Journal of Research and Applied Technology (INJURATECH), Vol. 2, no. 2, Nov. 2022, pp. 154-71, doi:10.34010/injuratech.v2i2.8372.