Eckersten, H. (1985). Willow growth as a function of climate, water and nitrogen. Swedish University of Agricultural Sciences, Dept. of Ecology and Environmental Research.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Eckersten, Henrik. Willow Growth as a Function of Climate, Water and Nitrogen. Uppsala: Swedish University of Agricultural Sciences, Dept. of Ecology and Environmental Research, 1985.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Eckersten, Henrik. Willow Growth as a Function of Climate, Water and Nitrogen. Swedish University of Agricultural Sciences, Dept. of Ecology and Environmental Research, 1985.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.