APA (7th ed.) Citation

Clark, V. S. (1930). Porto Rico and its problems. The Brookings Institution.

Chicago Style (17th ed.) Citation

Clark, Victor S. Porto Rico and Its Problems. Washington, D.C.: The Brookings Institution, 1930.

MLA (9th ed.) Citation

Clark, Victor S. Porto Rico and Its Problems. The Brookings Institution, 1930.