APA (7th ed.) Citation
Snellen, H. (1866). Test-types for the determination of the acuteness of vision.
Chicago Style (17th ed.) Citation
Snellen, Heinrich. Test-types for the Determination of the Acuteness of Vision. Utrecht, 1866.
MLA (9th ed.) Citation
Snellen, Heinrich. Test-types for the Determination of the Acuteness of Vision. 1866.
Warning: These citations may not always be 100% accurate.