APA (7th ed.) Citation

Slocum, R. (1939). A key to New York. Modern Age Books.

Chicago Style (17th ed.) Citation

Slocum, Rosalie. A Key to New York. New York: Modern Age Books, 1939.

MLA (9th ed.) Citation

Slocum, Rosalie. A Key to New York. Modern Age Books, 1939.