Bergmann, Peter Gabriel. Introduction to the theory of relativity, by Peter Gabriel Bergmann ... with a foreword by Albert Einstein. - New York : Prentice-Hall, inc., 1942 [reprint 1955,1964] - xvi, 287 p. : ill. ; 24 cm. Includes index. Subjects--Topical Terms: Relativity (Physics) Dewey Class. No.: 530.11 / BEI 1964