Birkeland, C. (1987). Comparison between Atlantic and Pacific tropical marine coastal ecosystems: Community structure, ecological processes and productivity. UNESCO-COMAR.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Birkeland, Charles. Comparison Between Atlantic and Pacific Tropical Marine Coastal Ecosystems: Community Structure, Ecological Processes and Productivity. París: UNESCO-COMAR, 1987.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Birkeland, Charles. Comparison Between Atlantic and Pacific Tropical Marine Coastal Ecosystems: Community Structure, Ecological Processes and Productivity. UNESCO-COMAR, 1987.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.