Klaudia, D., & Adam, P. (2021, December). The underground city: The tourism potential of water and sewage infrastructure: the example of Poland. Bulletin of Geography. Socio-Economic Series.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Klaudia, Dębczyńska, و Piasecki Adam. "The Underground City: The Tourism Potential of Water and Sewage Infrastructure: The Example of Poland." Bulletin of Geography. Socio-Economic Series Dec. 2021.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Klaudia, Dębczyńska, و Piasecki Adam. "The Underground City: The Tourism Potential of Water and Sewage Infrastructure: The Example of Poland." Bulletin of Geography. Socio-Economic Series, Dec. 2021.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.