Washington (State). Bureau of Labor. Workman's safety guide. State Labor Commissioner.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWashington (State). Bureau of Labor. Workman's Safety Guide. Olympia, Wash.: State Labor Commissioner.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWashington (State). Bureau of Labor. Workman's Safety Guide. State Labor Commissioner.
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