APA (7th ed.) Citation

Loken, R. D. 1. (1942). The Nela test of color vision. The Williams & Wilkins Company.

Chicago Style (17th ed.) Citation

Loken, Robert D. 1912-XXXX. The Nela Test of Color Vision. Baltimore, Maryland: The Williams & Wilkins Company, 1942.

MLA (9th ed.) Citation

Loken, Robert D. 1912-XXXX. The Nela Test of Color Vision. The Williams & Wilkins Company, 1942.