Cita APA (7th ed.)

Hagen, V. W. v. (1945). South America called them: Exploration of the Great Naturalists La Condamine, Humboldt, Darwin, Spruce (1a. ed.). Alfred A. Knopf.

Cita Chicago (17th ed.)

Hagen, Víctor Wolfgang von. South America Called Them: Exploration of the Great Naturalists La Condamine, Humboldt, Darwin, Spruce. 1a. ed. Nueva York: Alfred A. Knopf, 1945.

Cita MLA (9th ed.)

Hagen, Víctor Wolfgang von. South America Called Them: Exploration of the Great Naturalists La Condamine, Humboldt, Darwin, Spruce. 1a. ed. Alfred A. Knopf, 1945.