Commemorative Conference in Honor of Nicolaus Copernicus Washington, D.C., Beer, A., & Strand, K. A. (1975). Copernicus : yesterday and today: Proceedings of the Commemorative Conference held in Washington in honour of Nicolaus Copernicus (First edition.). Pergamon Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Commemorative Conference in Honor of Nicolaus Copernicus Washington, D.C., Arthur Beer, و K. Aage Strand. Copernicus : Yesterday and Today: Proceedings of the Commemorative Conference Held in Washington in Honour of Nicolaus Copernicus. First edition. Oxford ; New York: Pergamon Press, 1975.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Commemorative Conference in Honor of Nicolaus Copernicus Washington, D.C., et al. Copernicus : Yesterday and Today: Proceedings of the Commemorative Conference Held in Washington in Honour of Nicolaus Copernicus. First edition. Pergamon Press, 1975.