Grotefend, O. (2019). Archivmaterialien zu Otto Grotefend, 1873-1945.
芝加哥风格引文Grotefend, Otto. Archivmaterialien Zu Otto Grotefend, 1873-1945. 2019.
MLA引文Grotefend, Otto. Archivmaterialien Zu Otto Grotefend, 1873-1945. 2019.
警告：这些引文格式不一定是100％准确.
APA引文
