APA (7th ed.) Citation

Herrmann, F., & Schmalzle, P. (1981). Simple explanation of a well-known collision experiment. American Journal of Physics, 49, 761.

Chicago Style (17th ed.) Citation

Herrmann, F., and P. Schmalzle. "Simple Explanation of a Well-known Collision Experiment." American Journal of Physics 49 (1981): 761.

MLA (9th ed.) Citation

Herrmann, F., and P. Schmalzle. "Simple Explanation of a Well-known Collision Experiment." American Journal of Physics, vol. 49, 1981, p. 761.