APA

Ballard K. E., . (1972). Study guide for copi : introduction to logic. New York: Macmillan Publishers.

Chicago

Ballard Keith Emerson, . 1972. Study guide for copi : introduction to logic. New York: Macmillan Publishers.

Harvard

Ballard K. E., . (1972). Study guide for copi : introduction to logic. New York: Macmillan Publishers.

MLA

Ballard Keith Emerson, . Study guide for copi : introduction to logic. New York: Macmillan Publishers. 1972.