Hardwick, P., Khan, B., & Langmead, J. (1999). An introduction to modern economics (5th ed.). Peason education Limited.
芝加哥风格引文Hardwick, Philip, Bahadur Khan, 与 John Langmead. An Introduction to Modern Economics. 5th ed. Harlow: Peason education Limited, 1999.
MLA引文Hardwick, Philip, et al. An Introduction to Modern Economics. 5th ed. Peason education Limited, 1999.
警告：这些引文格式不一定是100％准确.