Cita APA (7a ed.)

Valls i Taberner, F., & Martínez López, M. (1990). An introductory history of discovery and exploration. Cometa.

Cita Chicago Style (17a ed.)

Valls i Taberner, Ferran, y Miguel Martínez López. An Introductory History of Discovery and Exploration. Zaragoza: Cometa, 1990.

Cita MLA (9a ed.)

Valls i Taberner, Ferran, y Miguel Martínez López. An Introductory History of Discovery and Exploration. Cometa, 1990.