APA (7th ed.) Citation

Jones, B. Z., & Boyd, L. G. (1971). The Harvard College Observatory: The first four directorships, 1839-1919. Belknap Press of Harvard University Press.

Chicago Style (17th ed.) Citation

Jones, Bessie Zaban, and Lyle Gifford Boyd. The Harvard College Observatory: The First Four Directorships, 1839-1919. Cambridge: Belknap Press of Harvard University Press, 1971.

MLA (9th ed.) Citation

Jones, Bessie Zaban, and Lyle Gifford Boyd. The Harvard College Observatory: The First Four Directorships, 1839-1919. Belknap Press of Harvard University Press, 1971.