Isichei, A. O. (2014). Nitrogen Concentration in the Major Grasses of the Derived and Guinea Savanna Zones of Nigeria in Relation to Season and Site.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Isichei, Augustine O. Nitrogen Concentration in the Major Grasses of the Derived and Guinea Savanna Zones of Nigeria in Relation to Season and Site. 2014.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Isichei, Augustine O. Nitrogen Concentration in the Major Grasses of the Derived and Guinea Savanna Zones of Nigeria in Relation to Season and Site. 2014.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.