APA Style

ULBRICH, H, H., AMACHER, R, C. (1989). Study Guide Principles of Microeconomics (1). Chicago: South-Western Publishing Co..

MLA Style

ULBRICH, HOLLEY, H.., AMACHER, RYAN, C.. "Study Guide Principles of Microeconomics". 1 Chicago: South-Western Publishing Co., 1989. Text.