Cita APA (7a ed.)

Otto, E., & Bòcher, F. French converstion-grammar (Third american edition.).

Cita Chicago Style (17a ed.)

Otto, Emil, y Ferdinand Bòcher. French Converstion-grammar. Third american edition. New York.

Cita MLA (8a ed.)

Otto, Emil, y Ferdinand Bòcher. French Converstion-grammar. Third american edition.