APA

Levy A., . (1978). Procedure to determine background luminance for use in esi and visual performance methods. Ottawa: National Research Council Canada. Division of Building Research. DBR paper no 818.

Chicago

Levy AW, . 1978. Procedure to determine background luminance for use in esi and visual performance methods. Ottawa: National Research Council Canada. Division of Building Research. DBR paper no 818.

Harvard

Levy A., . (1978). Procedure to determine background luminance for use in esi and visual performance methods. Ottawa: National Research Council Canada. Division of Building Research. DBR paper no 818.

MLA

Levy AW, . Procedure to determine background luminance for use in esi and visual performance methods. Ottawa: National Research Council Canada. Division of Building Research. DBR paper no 818. 1978.