Hobbs, G. M. (1972). Practical mathematics (3rd.ed.). American technical.
芝加哥风格引文Hobbs, Glen M. Practical Mathematics. 3rd.ed. Illinois: American technical, 1972.
MLA引文Hobbs, Glen M. Practical Mathematics. 3rd.ed. American technical, 1972.
警告：这些引文格式不一定是100％准确.