Dr. Anusiuba Overcomer Ifeanyi Alex, Okechukwu Ogochukwu Patience, Ekwealor Oluchukwu Uzoamaka and Anusiuba Amarachukwu Angela 2022. The Application of Hidden Markov Model in Credit Card Fraud Detection System . iJournals:International Journal of Software & Hardware Research in Engineering ISSN:2347-4890. 10, 2 (Feb. 2022).