The Observatory of Zi-ka-wei: [fifty years of scientific work.
APA Citation
Xujiahui guan xiang tai (China). (1929). The Observatory of Zi-ka-wei: [fifty years of scientific work. [Paris?].
MLA Citation
Xujiahui guan xiang tai (China). The Observatory of Zi-ka-wei: [fifty Years of Scientific Work. [Paris?], 1929.
Warning: These citations may not always be complete (especially for serials).