Lankford, F. G., & Ulrich , J. F. (1975). Essential mathematics (3rd ed.). Harcourt brace jovanovich.
芝加哥风格引文Lankford, Francis G., 与 James F. Ulrich. Essential Mathematics. 3rd ed. London: Harcourt brace jovanovich, 1975.
MLA引文Lankford, Francis G., 与 James F. Ulrich. Essential Mathematics. 3rd ed. Harcourt brace jovanovich, 1975.
警告：这些引文格式不一定是100％准确.