Gerking, S. D. Biological basis of Fresh- Water fish-production: A symposium sporsred by sectional committee on productivity...the University, reading , England1-6sept. 1966.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Gerking, Shelby D. Biological Basis of Fresh- Water Fish-production: A Symposium Sporsred by Sectional Committee on Productivity...the University, Reading , England1-6sept. 1966.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Gerking, Shelby D. Biological Basis of Fresh- Water Fish-production: A Symposium Sporsred by Sectional Committee on Productivity...the University, Reading , England1-6sept. 1966.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.