APA (7th ed.) Citation

Hale Observatories, Carnegie Institution, California Institute of Technology, & Carnegie Institution of Washington. (1970). Annual report of the director, Hale Observatories. Carnegie Institution, California Institute of Technology.

Chicago Style (17th ed.) Citation

Hale Observatories, Carnegie Institution, California Institute of Technology, and Carnegie Institution of Washington. Annual Report of the Director, Hale Observatories. Pasadena, Calif.: Carnegie Institution, California Institute of Technology, 1970.

MLA (8th ed.) Citation

Hale Observatories, et al. Annual Report of the Director, Hale Observatories. Carnegie Institution, California Institute of Technology, 1970.