Roman, S. (1989). An Introduction to discrete mathematics (2nd ed.). Harcourt Brace Jovanovich Publishers.
芝加哥风格引文Roman, Steven. An Introduction to Discrete Mathematics. 2nd ed. San Diego: Harcourt Brace Jovanovich Publishers, 1989.
MLA引文Roman, Steven. An Introduction to Discrete Mathematics. 2nd ed. Harcourt Brace Jovanovich Publishers, 1989.
警告：这些引文格式不一定是100％准确.