APA

McConnell Campbell R,, . (1987). Economics principles : Problems and policies. New york: McGraw-Hill Publishing Co.

Chicago

McConnell Campbell R,, . 1987. Economics principles : Problems and policies. New york: McGraw-Hill Publishing Co.

Harvard

McConnell Campbell R,, . (1987). Economics principles : Problems and policies. New york: McGraw-Hill Publishing Co.

MLA

McConnell Campbell R,, . Economics principles : Problems and policies. New york: McGraw-Hill Publishing Co. 1987.