Brockhaus-1911: Kauffmann [3] · Kauffmann [4] · Kauffmann · Kauffmann [2] · Oval
Herder-1854: Kauffmann · Oval
Meyers-1905: Kauffmann · Ovāl
Pataky-1898: Kauffmann, Hulda
Pierer-1857: Kauffmann · Oval