APA (7th ed.) Citation

Bollo, L. C., & Baros, N. (1919). South America, past and present. [publisher not identified].

Chicago Style (17th ed.) Citation

Bollo, Luis Cincinato, and Nemesio Baros. South America, Past and Present. New York: [publisher not identified], 1919.

MLA (9th ed.) Citation

Bollo, Luis Cincinato, and Nemesio Baros. South America, Past and Present. [publisher not identified], 1919.