APA

Estes R., . (1980). Value engineering study of rest area maintenance. Washington DC: U.S. Department of Transportation. FHWA. Office of Research and Development. Implementation Division.

Chicago

Estes R, . 1980. Value engineering study of rest area maintenance. Washington DC: U.S. Department of Transportation. FHWA. Office of Research and Development. Implementation Division.

Harvard

Estes R., . (1980). Value engineering study of rest area maintenance. Washington DC: U.S. Department of Transportation. FHWA. Office of Research and Development. Implementation Division.

MLA

Estes R, . Value engineering study of rest area maintenance. Washington DC: U.S. Department of Transportation. FHWA. Office of Research and Development. Implementation Division. 1980.