APA (7th ed.) Citation

Hempel, C. G., & Oppenheim, P. (1948). Studies in the logic of explanation (Repr.). Bobbs-Merrill.

Chicago Style (17th ed.) Citation

Hempel, Carl Gustav, and Paul Oppenheim. Studies in the Logic of Explanation. Repr. Indianapolis, Ind: Bobbs-Merrill, 1948.

MLA (9th ed.) Citation

Hempel, Carl Gustav, and Paul Oppenheim. Studies in the Logic of Explanation. Repr. Bobbs-Merrill, 1948.