توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

(2005). Effect on survey response rate of hand written versus printed signature on a covering letter: Randomised controlled trial [ISRCTN67566265]. BioMed Central.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Effect on Survey Response Rate of Hand Written versus Printed Signature on a Covering Letter: Randomised Controlled Trial [ISRCTN67566265]. BioMed Central, 2005.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

Effect on Survey Response Rate of Hand Written versus Printed Signature on a Covering Letter: Randomised Controlled Trial [ISRCTN67566265]. BioMed Central, 2005.