Cita APA (7a ed.)

Gibbon, L., & Herndon, L. (1854). Exploration of the Valley of the Amazon. Armstrong.

Cita Chicago Style (17a ed.)

Gibbon, Lardner, y L. Herndon. Exploration of the Valley of the Amazon. Washington: Armstrong, 1854.

Cita MLA (8a ed.)

Gibbon, Lardner, y L. Herndon. Exploration of the Valley of the Amazon. Armstrong, 1854.