Institution, 8. B. S. Time measurement instruments: Symbolization of control positions.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रInstitution, 8096 British Standards. Time Measurement Instruments: Symbolization of Control Positions.
एमएलए (9वां संस्करण) प्रशस्ति पत्रInstitution, 8096 British Standards. Time Measurement Instruments: Symbolization of Control Positions.
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