Norman, J. M., & Ritchie, E. Problem solving exercises in operational research. Vol.1. Lancord.
芝加哥风格引文Norman, J. M., 与 Eric Ritchie. Problem Solving Exercises in Operational Research. Vol.1. Lancaster: Lancord.
MLA引文Norman, J. M., 与 Eric Ritchie. Problem Solving Exercises in Operational Research. Vol.1. Lancord.
警告：这些引文格式不一定是100％准确.