Welch, P. J., & Welch, G. F. Economics: Theory and practice (5th ed.). Dryden.
芝加哥风格引文Welch, Patrick J., 与 Gerry F. Welch. Economics: Theory and Practice. 5th ed. Chicago: Dryden.
MLA引文Welch, Patrick J., 与 Gerry F. Welch. Economics: Theory and Practice. 5th ed. Dryden.
警告：这些引文格式不一定是100％准确.