APA (7th ed.) Citation

Cannon, A. J., & Nayall, M. W. (1949). The Annie J. Cannon memorial volume of the Henry Draper extension. Astronomical Observatory of Harvard College.

Chicago Style (17th ed.) Citation

Cannon, Annie J., and Margaret Walton Nayall. The Annie J. Cannon Memorial Volume of the Henry Draper Extension. Cambridge, Mass.: Astronomical Observatory of Harvard College, 1949.

MLA (8th ed.) Citation

Cannon, Annie J., and Margaret Walton Nayall. The Annie J. Cannon Memorial Volume of the Henry Draper Extension. Astronomical Observatory of Harvard College, 1949.