Brockhaus-1911: Constant [2] · Constant de Rebecque · Constant
Herder-1854: Constant de Rebecque · Constant
Meyers-1905: Constant [1] · Constant de Rebecque
Pagel-1901: Seguin, Edward Constant · Vanlair, Constant · Budin, Pierre Constant · Budin, Pierre Constant · Monod, Frédéric-Clément-Constant-Gustave · Sappey, Marie-Philibert-Constant
Pierer-1857: Constant [2] · Constant [1] · Constant de Rebecque