Richards, J. A. (1983). Analysis of periodically time-varying systems. Springer-Verlag.
芝加哥风格引文Richards, J. A. Analysis of Periodically Time-varying Systems. Berlin, New York: Springer-Verlag, 1983.
MLA引文Richards, J. A. Analysis of Periodically Time-varying Systems. Springer-Verlag, 1983.
警告：这些引文格式不一定是100％准确.