American Chemical Society. Division of Industrial and Engineering Chemistry, Gaffney, J. S., Marley, N. A., & Clark, S. B. (1996). Humic and fulvic acids: Isolation, structure, and environmental role. American Chemical Society.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)American Chemical Society. Division of Industrial and Engineering Chemistry, Jeffrey S. Gaffney, Nancy A. Marley, و Sue B. Clark. Humic and Fulvic Acids: Isolation, Structure, and Environmental Role. Washington, DC: American Chemical Society, 1996.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)American Chemical Society. Division of Industrial and Engineering Chemistry, et al. Humic and Fulvic Acids: Isolation, Structure, and Environmental Role. American Chemical Society, 1996.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.