World Register of Marine Species (WoRMS)
Hayward, B.W.; Le Coze, F.; Vachard, D.; Gross, O. (2026). World Foraminifera Database. Ammonia granuloumbilica Zheng, 1978. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=850210 on 2026-08-01
Zheng, S.-Y.; Cheng, T. C.; Wang, X. T.; Fu, Z. X. (1978). The Quaternary foraminifera of the Dayuzhang irrigation area, Shandong Province, and a preliminary attempt at an interpretation of its depositioal environment. Studia Marina Sinica. 13: 16-78.