Pars, L. A. (1962). An introduction to the calculus of variations. Heinemann.
芝加哥风格引文Pars, L. A. An Introduction to the Calculus of Variations. London, Melbourne: Heinemann, 1962.
MLA引文Pars, L. A. An Introduction to the Calculus of Variations. Heinemann, 1962.
警告：这些引文格式不一定是100％准确.