Franklin

MLA

Humphreys, Richard F, and Robert Beringer. First Principles of Atomic Physics. New York: Harper, 1950.

APA

Humphreys, R. F, & Beringer, R. (1950). First principles of atomic physics. New York: Harper.

Chicago

Humphreys, Richard F., and Robert Beringer. First Principles of Atomic Physics. New York: Harper, 1950.