Çakır, Huseyin, and Necla Uluhatun. “Robust Security Against Cyber Threats With Variety of captcha<p≫Güvenlik Kodu çeşitliliği Ile Siber Tehditlere karşı güçlü güvenliğin sağlanması”. Journal of Human Sciences 15, no. 3 (July 29, 2018): 1414–1430. Accessed May 1, 2024. https://www.j-humansciences.com/ojs/index.php/IJHS/article/view/5201.