Olvång, H. (1987). Investigations of resistance to fungicides in some plant pathogen-fungicide systems in Sweden. Swedish University of Agricultural Sciences, Dept. of Plant and Forest Protection.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Olvång, Hans. Investigations of Resistance to Fungicides in Some Plant Pathogen-fungicide Systems in Sweden. Uppsala: Swedish University of Agricultural Sciences, Dept. of Plant and Forest Protection, 1987.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Olvång, Hans. Investigations of Resistance to Fungicides in Some Plant Pathogen-fungicide Systems in Sweden. Swedish University of Agricultural Sciences, Dept. of Plant and Forest Protection, 1987.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.