APA (7th ed.) Citation

Gregory, D. (1972). The elements of physical and geometrical astronomy.: To which is annex'd, Dr. Halley's synopsis of the astronomy of comets. Johnson Reprint Corp..

Chicago Style (17th ed.) Citation

Gregory, David. The Elements of Physical and Geometrical Astronomy.: To Which Is Annex'd, Dr. Halley's Synopsis of the Astronomy of Comets. New York: Johnson Reprint Corp., 1972.

MLA (9th ed.) Citation

Gregory, David. The Elements of Physical and Geometrical Astronomy.: To Which Is Annex'd, Dr. Halley's Synopsis of the Astronomy of Comets. Johnson Reprint Corp., 1972.