Ahbe, S., Weihofen, S., & Wellge, S. (2020). The Ecological Scarcity Method for the European Union. 1st ed. 2018. Springer Fachmedien Wiesbaden.
استشهاد بنمط شيكاغوAhbe, Stephan, Simon Weihofen, و Steffen Wellge. The Ecological Scarcity Method for the European Union. 1st Ed. 2018. Springer Fachmedien Wiesbaden, 2020.
MLA استشهادAhbe, Stephan, Simon Weihofen, و Steffen Wellge. The Ecological Scarcity Method for the European Union. 1st Ed. 2018. Springer Fachmedien Wiesbaden, 2020.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.