Rusak, S. N.; Shornikova, E. A.; Kurilenko, M. I.; Homenushko, T. I. (2019). Transboundary aspects of river water pollution and water quality estimation of the Middle Ob river. IOP Conf. Series: Earth and Environmental Science. doi:10.1088/1755-1315/400/1/012018.
"Ob River". Encyclopedia Britannica. Archived from the original on 2022-10-22. Retrieved 2022-10-22.
"Ob River at Salekhard". River Discharge Database. Center for Sustainability and the Global Environment. 2010-02-13. Archived from the original on 2010-06-12. Retrieved 2010-11-06.
One or more of the preceding sentences incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Ob". Encyclopædia Britannica. Vol. 19 (11th ed.). Cambridge University Press. p. 944.
"Ob River at Salekhard". River Discharge Database. Center for Sustainability and the Global Environment. 2010-02-13. Archived from the original on 2010-06-12. Retrieved 2010-11-06.