Cita APA (7a ed.)

Hudson, G. E. (1923). The book of a naturalist. J. M. Dent and Sons.

Cita Chicago Style (17a ed.)

Hudson, Guillermo Enrique. The Book of a Naturalist. London: J. M. Dent and Sons, 1923.

Cita MLA (9a ed.)

Hudson, Guillermo Enrique. The Book of a Naturalist. J. M. Dent and Sons, 1923.