Ocran, E. B. (1974). Outline history of classification: An essay. Educational Resources Information Center.
芝加哥风格引文Ocran, Emanuel Benjamin. Outline History of Classification: An Essay. Washington, D. C.: Educational Resources Information Center, 1974.
MLA引文Ocran, Emanuel Benjamin. Outline History of Classification: An Essay. Educational Resources Information Center, 1974.
警告：这些引文格式不一定是100％准确.