APA (7th ed.) Citation

Geiger, F. E., & Cunningham, F. G. (1964). Ambipolar diffusion in semiconductors. American Journal of Physics, 32, 336.

Chicago Style (17th ed.) Citation

Geiger, F. E., and F. G. Cunningham. "Ambipolar Diffusion in Semiconductors." American Journal of Physics 32 (1964): 336.

MLA (9th ed.) Citation

Geiger, F. E., and F. G. Cunningham. "Ambipolar Diffusion in Semiconductors." American Journal of Physics, vol. 32, 1964, p. 336.