Juan, J., & Ulloa, A. d. (1851). Secret expedition to Peru: Or, The practical influence of the Spanish Colonial system upon the character and habits of the Colonists : exhibited in a private report read to the secretaries of his majesty, Ferdinand VI King of Spain (Abridged.). Crocker and Brewster.

Juan, Jorge, and Anthonio de Ulloa. Secret Expedition to Peru: Or, The Practical Influence of the Spanish Colonial System upon the Character and Habits of the Colonists : Exhibited in a Private Report Read to the Secretaries of His Majesty, Ferdinand VI King of Spain. Abridged. Boston: Crocker and Brewster, 1851.

Juan, Jorge, and Anthonio de Ulloa. Secret Expedition to Peru: Or, The Practical Influence of the Spanish Colonial System upon the Character and Habits of the Colonists : Exhibited in a Private Report Read to the Secretaries of His Majesty, Ferdinand VI King of Spain. Abridged. Crocker and Brewster, 1851.