Siegert, L. (2011). Sustainable development approaches in the food and beverage industry: A comparison between nestl©♭ SA and Kraft Foods Inc. Anchor Academic Publishing.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Siegert, Lars. Sustainable Development Approaches in the Food and Beverage Industry: A Comparison Between Nestl©♭ SA and Kraft Foods Inc. Hamburg, Germany: Anchor Academic Publishing, 2011.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Siegert, Lars. Sustainable Development Approaches in the Food and Beverage Industry: A Comparison Between Nestl©♭ SA and Kraft Foods Inc. Anchor Academic Publishing, 2011.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.