Roberts, K. M., Lareau, E. W., & Welch, D. (1977). Perceptual factors and meanings of symbolic information elements. Dept. of Transportation, Federal Highway Administration, Offices of Research and Development.
Chicago Style (17th ed.) CitationRoberts, King M., Ernest W. Lareau, and Daniel Welch. Perceptual Factors and Meanings of Symbolic Information Elements. Washington: Dept. of Transportation, Federal Highway Administration, Offices of Research and Development, 1977.
MLA (9th ed.) CitationRoberts, King M., et al. Perceptual Factors and Meanings of Symbolic Information Elements. Dept. of Transportation, Federal Highway Administration, Offices of Research and Development, 1977.
Warning: These citations may not always be 100% accurate.