Nguyễn Khang (February 8, 2014). "Nghi án Flappy bird... đạo game". Thanh Niên Online. Archived from the original on September 9, 2017. Retrieved February 14, 2014.
Nguyễn Khang (February 8, 2014). "Nghi án Flappy bird... đạo game". Thanh Niên Online. Archived from the original on September 9, 2017. Retrieved February 14, 2014.