APA

Levy A., . (1977). Visual performance, visibility, and apparent contrast. ( Lighting Design and Application. Vol 7. 1977, nr 11, s 23-6). Ottawa: National Research Council Canada. DBR paper nr 755.

Chicago

Levy AW, . 1977. Visual performance, visibility, and apparent contrast. ( Lighting Design and Application. Vol 7. 1977, nr 11, s 23-6). Ottawa: National Research Council Canada. DBR paper nr 755.

Harvard

Levy A., . (1977). Visual performance, visibility, and apparent contrast. ( Lighting Design and Application. Vol 7. 1977, nr 11, s 23-6). Ottawa: National Research Council Canada. DBR paper nr 755.

MLA

Levy AW, . Visual performance, visibility, and apparent contrast. ( Lighting Design and Application. Vol 7. 1977, nr 11, s 23-6). Ottawa: National Research Council Canada. DBR paper nr 755. 1977.