توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Virtanen, R. (1996). Arctic and oroarctic vegetation patterns in Northern Europe as a consequence of topography, climate, bedrock conditions and grazing. University of Oulu.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Virtanen, Risto. Arctic and Oroarctic Vegetation Patterns in Northern Europe as a Consequence of Topography, Climate, Bedrock Conditions and Grazing. Oulu, Finland: University of Oulu, 1996.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Virtanen, Risto. Arctic and Oroarctic Vegetation Patterns in Northern Europe as a Consequence of Topography, Climate, Bedrock Conditions and Grazing. University of Oulu, 1996.