APA (7th ed.) Citation

Baker, D. W. P. History of the Harvard College Observatory During the Period 1840-1890.

Chicago Style (17th ed.) Citation

Baker, Daniel W.; Pickering. History of the Harvard College Observatory During the Period 1840-1890.

MLA (9th ed.) Citation

Baker, Daniel W.; Pickering. History of the Harvard College Observatory During the Period 1840-1890.

Warning: These citations may not always be 100% accurate.