John, J., & Ziebland, S. (2004). Reported barriers to eating more fruit and vegetables before and after participation in a randomized controlled trial: A qualitative study.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)John, J., و S. Ziebland. Reported Barriers to Eating More Fruit and Vegetables Before and After Participation in a Randomized Controlled Trial: A Qualitative Study. 2004.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)John, J., و S. Ziebland. Reported Barriers to Eating More Fruit and Vegetables Before and After Participation in a Randomized Controlled Trial: A Qualitative Study. 2004.
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