APA (7th ed.) Citation

Rasmussen, K. A. Camera obscura ([Set of parts].). Wilhelm Hansen.

Chicago Style (17th ed.) Citation

Rasmussen, Karl Aage. Camera Obscura. [Set of parts]. [Copenhagen?]: Wilhelm Hansen.

MLA (9th ed.) Citation

Rasmussen, Karl Aage. Camera Obscura. [Set of parts]. Wilhelm Hansen.

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