@misc{1185321,
  author = {Gary T Yonemura and William M Benson and Robert Tibbott},
  title = {Levels of illumination and legibility:},
  year = {1977},
  month = {1977-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IR.77-1306},
  language = {en},
}