APA (7th ed.) Citation

Otto, E. Key to the French Conversation-Grammar: Method Gaspey-Otto-Sauer (11. ed.).

Chicago Style (17th ed.) Citation

Otto, Emil. Key to the French Conversation-Grammar: Method Gaspey-Otto-Sauer. 11. ed.

MLA (9th ed.) Citation

Otto, Emil. Key to the French Conversation-Grammar: Method Gaspey-Otto-Sauer. 11. ed.

Warning: These citations may not always be 100% accurate.