I. Munfaridah, N. F. Maliha, M. A. Royyani, and K. M. A. S. Bayumi, “Karl Popper’s Falsification Theory of the Determination of the Gregorian Calendar Based on the Book of Risalatul Falakiyah K.H Misbachul Munir”, Int. J. Ihya’ ’Ulum al-Din, vol. 25, no. 2, pp. 154–167, Dec. 2023.