APA (7th ed.) Citation

May, D. W. (1922). Dairying in Porto Rico. Gov. Print. Off.

Chicago Style (17th ed.) Citation

May, David William. Dairying in Porto Rico. Washington: Gov. Print. Off, 1922.

MLA (9th ed.) Citation

May, David William. Dairying in Porto Rico. Gov. Print. Off, 1922.