Institution, 8. B. S. Thermally insulated underground piping systems.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रInstitution, 8096 British Standards. Thermally Insulated Underground Piping Systems.
एमएलए (9वां संस्करण) प्रशस्ति पत्रInstitution, 8096 British Standards. Thermally Insulated Underground Piping Systems.
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