Portass, R., & Wickham, C. (2011). Society, Community and Power in Northern Spain: 700-1000.
芝加哥风格引文Portass, R., 与 C. Wickham. Society, Community and Power in Northern Spain: 700-1000. 2011.
MLA引文Portass, R., 与 C. Wickham. Society, Community and Power in Northern Spain: 700-1000. 2011.
警告：这些引文格式不一定是100％准确.