Amacher, R. C., & Ulbrich, H. H. (1995). Economic principles & policy (6th ed.). South-Western College.
芝加哥风格引文Amacher, Ryan C., 与 Holley H. Ulbrich. Economic Principles & Policy. 6th ed. Cincinnati: South-Western College, 1995.
MLA引文Amacher, Ryan C., 与 Holley H. Ulbrich. Economic Principles & Policy. 6th ed. South-Western College, 1995.
警告：这些引文格式不一定是100％准确.