Citazione Stile APA (7a Edizione)

Vogelin, C. F., & Vogelin, F. M. (1977). Classification and index of the world's language. Elsevier.

Citazione stile Chigago Style (17a edizione)

Vogelin, Charles Frederick, e Florence Marie Vogelin. Classification and Index of the World's Language. New York: Elsevier, 1977.

Citatione MLA (9a ed.)

Vogelin, Charles Frederick, e Florence Marie Vogelin. Classification and Index of the World's Language. Elsevier, 1977.