APA استشهاد

Einstein, A. (1974). Relativity: The special and the general theory.

استشهاد بنمط شيكاغو

Einstein, Albert. Relativity: The Special and the General Theory. Methuen & Co., London, 1974.

MLA استشهاد

Einstein, Albert. Relativity: The Special and the General Theory. 1974.