APA (7th ed.) Citation

Ponsonby, S. F., & Mayer,Anton. Briefe der Kaiserin Friedrich (o.A.). Th. Knaur Nachf. Verlag.

Chicago Style (17th ed.) Citation

Ponsonby, Sir Frederick, and Mayer,Anton. Briefe Der Kaiserin Friedrich. o.A. Berlin: Th. Knaur Nachf. Verlag.

MLA (8th ed.) Citation

Ponsonby, Sir Frederick, and Mayer,Anton. Briefe Der Kaiserin Friedrich. o.A. Th. Knaur Nachf. Verlag.

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