Barrett, K. J. (2000). Canadian agricultural biotechnology: Risk assessment and the precautionary principle. Faculty of Graduate Studies, University of British Columbia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Barrett, Katherine Jean. Canadian Agricultural Biotechnology: Risk Assessment and the Precautionary Principle. Vancouver: Faculty of Graduate Studies, University of British Columbia, 2000.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Barrett, Katherine Jean. Canadian Agricultural Biotechnology: Risk Assessment and the Precautionary Principle. Faculty of Graduate Studies, University of British Columbia, 2000.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.