APA (7th ed.) Citation

Forrer, M., Frenz, M., & Zweig, A. D. (1991). Autofocus system for a surgical CO2 laser. Applied Optics, 30, 1480. https://doi.org/10.1364/AO.30.001480

Chicago Style (17th ed.) Citation

Forrer, M., M. Frenz, and A. D. Zweig. "Autofocus System for a Surgical CO2 Laser." Applied Optics 30 (1991): 1480. https://doi.org/10.1364/AO.30.001480.

MLA (9th ed.) Citation

Forrer, M., et al. "Autofocus System for a Surgical CO2 Laser." Applied Optics, vol. 30, 1991, p. 1480, https://doi.org/10.1364/AO.30.001480.