(2005). Effect on survey response rate of hand written versus printed signature on a covering letter: Randomised controlled trial [ISRCTN67566265]. BioMed Central.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEffect on Survey Response Rate of Hand Written versus Printed Signature on a Covering Letter: Randomised Controlled Trial [ISRCTN67566265]. BioMed Central, 2005.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEffect on Survey Response Rate of Hand Written versus Printed Signature on a Covering Letter: Randomised Controlled Trial [ISRCTN67566265]. BioMed Central, 2005.
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