APA

McConnell C. R., . (1981). Economics: principles, problems, and policies. New York: McGraw-Hill.

Chicago

McConnell Campbell R, . 1981. Economics: principles, problems, and policies. New York: McGraw-Hill.

Harvard

McConnell C. R., . (1981). Economics: principles, problems, and policies. New York: McGraw-Hill.

MLA

McConnell Campbell R, . Economics: principles, problems, and policies. New York: McGraw-Hill. 1981.