Obilor, Njoku A., Agbakwuru A. Onyekachi, Amanze B. Chibuike, and Njoku O. Donatus. 2021. “Constructive Cost Model II Metrics for Estimating Cost of Indigenous Software”. International Journal of Advanced Engineering Research and Science 8 (7). https://journal-repository.com/index.php/ijaers/article/view/3889.