Cita APA (7a ed.)

(1957). Pan American Union Publications: In English, Spanish, Portuguese and French. Pan American Union.

Cita Chicago Style (17a ed.)

Pan American Union Publications: In English, Spanish, Portuguese and French. Washington: Pan American Union, 1957.

Cita MLA (8a ed.)

Pan American Union Publications: In English, Spanish, Portuguese and French. Pan American Union, 1957.