ebrary, Inc, & O'Sullivan, D. E. (2012). Chess in the Middle Ages and early modern age: A fundamental thought paradigm of the premodern world. De Gruyter.

ebrary, Inc, and Daniel E. O'Sullivan. Chess in the Middle Ages and Early Modern Age: A Fundamental Thought Paradigm of the Premodern World. Boston: De Gruyter, 2012.

ebrary, Inc, and Daniel E. O'Sullivan. Chess in the Middle Ages and Early Modern Age: A Fundamental Thought Paradigm of the Premodern World. De Gruyter, 2012.