Baerwald, J. E. (1976). Transportation and traffic engineering handbook. Prentice Hall.
शिकागो स्टाइल उद्धरणBaerwald, John E. Transportation and Traffic Engineering Handbook. Prentice Hall, 1976.
एमएलए उद्धरणBaerwald, John E. Transportation and Traffic Engineering Handbook. Prentice Hall, 1976.
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