APA (7th ed.) Citation

Sterns, M. (1947). Directory of astronomical observatories in the United States. J.W. Edwards.

Chicago Style (17th ed.) Citation

Sterns, Mabel. Directory of Astronomical Observatories in the United States. Ann Arbor, Mich.: J.W. Edwards, 1947.

MLA (9th ed.) Citation

Sterns, Mabel. Directory of Astronomical Observatories in the United States. J.W. Edwards, 1947.