APA Style

Einstein, ), A. (1916 (). Relativity: The Special and the General Theory (Reprint / Popular edition (depends on your copy)). London / Princeton: Routledge / Princeton University Press (choose based on your book).

MLA Style

Einstein, ):, Albert. "Relativity: The Special and the General Theory". Reprint / Popular edition (depends on your copy) London / Princeton: Routledge / Princeton University Press (choose based on your book), 1916 (. Text.