Book 1: Great Wall of China (Carla Mooney, 2016, Rourke Educational Media)
Book 2: The Great Wall of China: From History to Myth (Arthur Waldron, 1990, Cambridge University Press)
Article 1: The Historical Process of the Masonry City Walls Construction in China During 1st to 17th Centuries AD (Qiaofeng Xue, 2019, Plos One)
Article 2: The Great Wall of China: Progress of the Wall over Major Eras (Joseph DiFrancesco, 2017, The College at Brockport: State University of New York)