APA (7th ed.) Citation

Butler, O. M. (1927). The Philippine islands: A commercial survey. Govt. Print. Off.

Chicago Style (17th ed.) Citation

Butler, O. M. The Philippine Islands: A Commercial Survey. Washington, D.C: Govt. Print. Off, 1927.

MLA (9th ed.) Citation

Butler, O. M. The Philippine Islands: A Commercial Survey. Govt. Print. Off, 1927.

Warning: These citations may not always be 100% accurate.