SpringerLink (Online service), Wöhl, S., Springler, E., Pachel, M., & Zeilinger, B. (2020). The State of the European Union: Fault Lines in European Integration (1st ed. 2020.). Springer Fachmedien Wiesbaden : Imprint: Springer VS. https://doi.org/10.1007/978-3-658-25419-3
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)SpringerLink (Online service), Stefanie Wöhl, Elisabeth Springler, Martin Pachel, و Bernhard Zeilinger. The State of the European Union: Fault Lines in European Integration. 1st ed. 2020. Wiesbaden: Springer Fachmedien Wiesbaden : Imprint: Springer VS, 2020. https://doi.org/10.1007/978-3-658-25419-3.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)SpringerLink (Online service), et al. The State of the European Union: Fault Lines in European Integration. 1st ed. 2020. Springer Fachmedien Wiesbaden : Imprint: Springer VS, 2020. https://doi.org/10.1007/978-3-658-25419-3.