Fröding, A. (1992). Beståndsskador vid Gallring =: Thinning damage to coniferous stands in Sweden. Swedish University of Agricultural Sciences, Faculty of Forestry, Dept. of Operational Efficiency.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Fröding, Anders. Beståndsskador Vid Gallring =: Thinning Damage to Coniferous Stands in Sweden. [Garpenberg, Sweden: Swedish University of Agricultural Sciences, Faculty of Forestry, Dept. of Operational Efficiency, 1992.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Fröding, Anders. Beståndsskador Vid Gallring =: Thinning Damage to Coniferous Stands in Sweden. Swedish University of Agricultural Sciences, Faculty of Forestry, Dept. of Operational Efficiency, 1992.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.