International Labour Organization. Factors affecting productivity in the metal trades. International Labour Organization.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रInternational Labour Organization. Factors Affecting Productivity in the Metal Trades. Geneve: International Labour Organization.
एमएलए (9वां संस्करण) प्रशस्ति पत्रInternational Labour Organization. Factors Affecting Productivity in the Metal Trades. International Labour Organization.
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