APA (7th ed.) Citation

Birkhoff, G. D. (1923). Relativity and modern physics. Harvard Univ. Press.

Chicago Style (17th ed.) Citation

Birkhoff, George David. Relativity and Modern Physics. Cambridge: Harvard Univ. Press, 1923.

MLA (9th ed.) Citation

Birkhoff, George David. Relativity and Modern Physics. Harvard Univ. Press, 1923.