APA (7th ed.) Citation

Einstein, A. (1961). Relativity: The special and the general theory ; a popular exposition (2nd ed.). Crown Publishers.

Chicago Style (17th ed.) Citation

Einstein, Albert. Relativity: The Special and the General Theory ; a Popular Exposition. 2nd ed. New York: Crown Publishers, 1961.

MLA (9th ed.) Citation

Einstein, Albert. Relativity: The Special and the General Theory ; a Popular Exposition. 2nd ed. Crown Publishers, 1961.

Warning: These citations may not always be 100% accurate.