Heers, J. (1977). Family clans in the Middle Ages: A study of political and social structures in urban areas. North-Holland Pub. Co..
芝加哥风格引文Heers, Jacques. Family Clans in the Middle Ages: A Study of Political and Social Structures in Urban Areas. Amsterdam ; New York: North-Holland Pub. Co., 1977.
MLA引文Heers, Jacques. Family Clans in the Middle Ages: A Study of Political and Social Structures in Urban Areas. North-Holland Pub. Co., 1977.
警告：这些引文格式不一定是100％准确.