Kreps, J. M. (1963). Employment, income, and retirement problems of the aged. Duke University Press.
芝加哥风格引文Kreps, Juanita M. Employment, Income, and Retirement Problems of the Aged. Durham, N.C.: Duke University Press, 1963.
MLA引文Kreps, Juanita M. Employment, Income, and Retirement Problems of the Aged. Duke University Press, 1963.
警告：这些引文格式不一定是100％准确.