Gikunju Muriuki, D., Kamaku Waweru, P., & Wali Nzomo, A. (2019). Properties of the International Standard Serial Number. International Journal of Sciences: Basic and Applied Research (IJSBAR), 47(1), 117–129. Retrieved from https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/10092