Cita APA (7th ed.)
Snow, P. History of the World Map by Map. Dorling Kindersley : Smithsonian Institution.
Cita Chicago (17th ed.)
Snow, Peter. History of the World Map by Map. Nueva York, EUA: Dorling Kindersley : Smithsonian Institution.
Cita MLA (9th ed.)
Snow, Peter. History of the World Map by Map. Dorling Kindersley : Smithsonian Institution.
Atenció: Aquestes cites poden no estar 100% correctes.