APA

Kegley C. W., Kegley J. A., .Introduction to logic. Columbus: .

Chicago

Kegley Charles W, Kegley Jacquelyn Ann, .Introduction to logic. Columbus: .

Harvard

Kegley C. W., Kegley J. A., .Introduction to logic. Columbus: .

MLA

Kegley Charles W, Kegley Jacquelyn Ann, .Columbus: . .