Cita APA (7a ed.)
Einstein, A. (1921). Relativity: The special and the general theory.
Cita Chicago Style (17a ed.)
Einstein, Albert. Relativity: The Special and the General Theory. London, 1921.
Cita MLA (9a ed.)
Einstein, Albert. Relativity: The Special and the General Theory. 1921.
Precaución: Estas citas no son 100% exactas.