APA (7th ed.) Citation

Smith, D. (1937). Some marks of progress in Puerto Rico resulting from increased trade.

Chicago Style (17th ed.) Citation

Smith, Dudley. Some Marks of Progress in Puerto Rico Resulting from Increased Trade. 1937.

MLA (9th ed.) Citation

Smith, Dudley. Some Marks of Progress in Puerto Rico Resulting from Increased Trade. 1937.

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