Shafer, R. J. (1980). A guide to historical method (3rd ed.). Dorsey.
芝加哥风格引文Shafer, Robert J. A Guide to Historical Method. 3rd ed. Ontario: Dorsey, 1980.
MLA引文Shafer, Robert J. A Guide to Historical Method. 3rd ed. Dorsey, 1980.
警告：这些引文格式不一定是100％准确.