Citazione Stile APA (7a Edizione)

(1980). The discoverers: En encyclopedia of explorers and exploration. McGraw-Hill.

Citazione stile Chigago Style (17a edizione)

The Discoverers: En Encyclopedia of Explorers and Exploration. New York: McGraw-Hill, 1980.

Citatione MLA (9a ed.)

The Discoverers: En Encyclopedia of Explorers and Exploration. McGraw-Hill, 1980.