APA (7th ed.) Citation

Landau, L. D., & Rumer, :. B. (1961). What is relativity? Basic Books.

Chicago Style (17th ed.) Citation

Landau, L. D., and :I:U. B. Rumer. What Is Relativity? New York: Basic Books, 1961.

MLA (9th ed.) Citation

Landau, L. D., and :I:U. B. Rumer. What Is Relativity? Basic Books, 1961.