APA (7th ed.) Citation

Columbus, C., Curtis, W. E., & Rodrigues, J. I. (1895). The authentic letters of Columbus. Field Columbian Museum.

Chicago Style (17th ed.) Citation

Columbus, Christopher, William Eleroy Curtis, and Jose Ignacio Rodrigues. The Authentic Letters of Columbus. Chicago: Field Columbian Museum, 1895.

MLA (9th ed.) Citation

Columbus, Christopher, et al. The Authentic Letters of Columbus. Field Columbian Museum, 1895.