Cita APA (7a ed.)

Metcalf, R. C., & Bright, O. T. (1894). Language lessons. American Book Company.

Cita Chicago Style (17a ed.)

Metcalf, Robert C., y Orville T. Bright. Language Lessons. New York ; Cincinnati [etc.]: American Book Company, 1894.

Cita MLA (8a ed.)

Metcalf, Robert C., y Orville T. Bright. Language Lessons. American Book Company, 1894.