Gardner, B. S. (1984). Economics: Study guide. Houghton Mifflin.
芝加哥风格引文Gardner, Bronfenbrenner Sichel. Economics: Study Guide. Boston: Houghton Mifflin, 1984.
MLA引文Gardner, Bronfenbrenner Sichel. Economics: Study Guide. Houghton Mifflin, 1984.
警告：这些引文格式不一定是100％准确.