Ullman, P. L. (1988). A contrapuntal method for analyzing Spanish literature. Scripta Humanistica.
芝加哥风格引文Ullman, Pierre L. A Contrapuntal Method for Analyzing Spanish Literature. Potomac, Md., U.S.A.: Scripta Humanistica, 1988.
MLA引文Ullman, Pierre L. A Contrapuntal Method for Analyzing Spanish Literature. Scripta Humanistica, 1988.
警告：这些引文格式不一定是100％准确.