Ruffin, R., & Gregory, P. R. (1990). Principles of microeconomics (4th ed.). Scott, Foresman.
芝加哥风格引文Ruffin, Roy, 与 Paul R. Gregory. Principles of Microeconomics. 4th ed. Scott, Foresman, 1990.
MLA引文Ruffin, Roy, 与 Paul R. Gregory. Principles of Microeconomics. 4th ed. Scott, Foresman, 1990.
警告：这些引文格式不一定是100％准确.