Camera obscura

MLA

Beets, Nicolaas. Camera Obscura. 3rd ed. Haarlem: Bohn, 1851.

APA

Beets, N. (1851). Camera obscura. 3rd ed. Haarlem: Bohn.

Chicago

Beets, Nicolaas Camera Obscura. 3rd ed. Haarlem: Bohn, 1851.