APA

Bergmann. Peter, . (1992). The Riddle of Gravitation Revised and Updated Edition. New york: Dover Publivations, Inc.

Chicago

Bergmann. Peter, . 1992. The Riddle of Gravitation Revised and Updated Edition. New york: Dover Publivations, Inc.

Harvard

Bergmann. Peter, . (1992). The Riddle of Gravitation Revised and Updated Edition. New york: Dover Publivations, Inc.

MLA

Bergmann. Peter, . The Riddle of Gravitation Revised and Updated Edition. New york: Dover Publivations, Inc. 1992.