توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Nitsch, U. (1982). Farmers' perceptions of and preferences concerning agricultural extension programs. Swedish University of Agricultural Sciences, Dept. of Economics and Statistics.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Nitsch, Ulrich. Farmers' Perceptions of and Preferences Concerning Agricultural Extension Programs. Uppsala: Swedish University of Agricultural Sciences, Dept. of Economics and Statistics, 1982.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Nitsch, Ulrich. Farmers' Perceptions of and Preferences Concerning Agricultural Extension Programs. Swedish University of Agricultural Sciences, Dept. of Economics and Statistics, 1982.