Cita APA (7a ed.)

Butterfield, C. (2015). United States and México: Commerce, trade, and postal facilities between tha two countries.

Cita Chicago Style (17a ed.)

Butterfield, Carlos. United States and México: Commerce, Trade, and Postal Facilities Between Tha Two Countries. 2015.

Cita MLA (9a ed.)

Butterfield, Carlos. United States and México: Commerce, Trade, and Postal Facilities Between Tha Two Countries. 2015.