APA (7th ed.) Citation

Brockhoff, J., & Hünnekes, G. (1904). Ex Libris G. Hünnekes.

Chicago Style (17th ed.) Citation

Brockhoff, Johann, and Gerd Hünnekes. Ex Libris G. Hünnekes. [München, 1904.

MLA (9th ed.) Citation

Brockhoff, Johann, and Gerd Hünnekes. Ex Libris G. Hünnekes. 1904.

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