Warner, P. (2004). Sieges of the middle ages. Pen & Sword Military Classics.
芝加哥风格引文Warner, Philip. Sieges of the Middle Ages. South Yorkshire, England: Pen & Sword Military Classics, 2004.
MLA引文Warner, Philip. Sieges of the Middle Ages. Pen & Sword Military Classics, 2004.
警告：这些引文格式不一定是100％准确.