Welsh, K. W., Rasmussen, P. G., & Vaughan, J. A. (1977). Refractive error characteristics of early and advanced presbyopic individuals. Dept. of Transportation, Federal Aviation Administration.
Chicago Style (17th ed.) CitationWelsh, Kenneth W., P. G. Rasmussen, and John A. Vaughan. Refractive Error Characteristics of Early and Advanced Presbyopic Individuals. Washington: Dept. of Transportation, Federal Aviation Administration, 1977.
MLA (9th ed.) CitationWelsh, Kenneth W., et al. Refractive Error Characteristics of Early and Advanced Presbyopic Individuals. Dept. of Transportation, Federal Aviation Administration, 1977.
Warning: These citations may not always be 100% accurate.