Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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