APA (7th ed.) Citation

Cohen, M. R., & Nagel, E. (1944). An introduction to logic and scientific method. US Armed Forces Inst.

Chicago Style (17th ed.) Citation

Cohen, Morris R., and Ernest Nagel. An Introduction to Logic and Scientific Method. Madison, Wis: US Armed Forces Inst, 1944.

MLA (9th ed.) Citation

Cohen, Morris R., and Ernest Nagel. An Introduction to Logic and Scientific Method. US Armed Forces Inst, 1944.