[856] Imperial, Sorte Thee, s.d. S. 460.
Brockhaus-1911: Imperial [2] · Imperial Federation League · Imperial
Meyers-1905: Imperial Standard Gallon · Imperiāl [1] · Imperiāl [2] · Imperial Federation League · Imperial Institute · Imperial Standard
Pierer-1857: Port Impérial · Villa imperial del Oira preto · Imperial [3] · Imperial [1] · Imperial [2]