Jonkel, Charles J.; Kolenosky, George B.; Robertson, Richard J.; Russell, Richard H. (1972). "Further Notes on Polar Bear Denning Habits". Bears: Their Biology and Management. 2: 142–158. doi:10.2307/3872578. ISSN1936-0614. JSTOR3872578.
Mukherjee, Aditi., Pilakandy, Rajan., Kumara Honnavalli Nagaraj., Manchi, Shirish S., Bhupathy, Subramanian. (June 2017). "Burrow characteristics and its importance in occupancy of burrow dwelling vertebrates in Semiarid area of Keoladeo National Park, Rajasthan, India". Journal of Arid Environments. 141: 7–15. Bibcode:2017JArEn.141....7M. doi:10.1016/j.jaridenv.2017.02.003.{{cite journal}}: CS1 maint: multiple names: authors list (link)
Mukherjee, Aditi., Pilakandy, Rajan., Kumara Honnavalli Nagaraj., Manchi, Shirish S., Bhupathy, Subramanian. (June 2017). "Burrow characteristics and its importance in occupancy of burrow dwelling vertebrates in Semiarid area of Keoladeo National Park, Rajasthan, India". Journal of Arid Environments. 141: 7–15. Bibcode:2017JArEn.141....7M. doi:10.1016/j.jaridenv.2017.02.003.{{cite journal}}: CS1 maint: multiple names: authors list (link)
Jonkel, Charles J.; Kolenosky, George B.; Robertson, Richard J.; Russell, Richard H. (1972). "Further Notes on Polar Bear Denning Habits". Bears: Their Biology and Management. 2: 142–158. doi:10.2307/3872578. ISSN1936-0614. JSTOR3872578.
Jonkel, Charles J.; Kolenosky, George B.; Robertson, Richard J.; Russell, Richard H. (1972). "Further Notes on Polar Bear Denning Habits". Bears: Their Biology and Management. 2: 142–158. doi:10.2307/3872578. ISSN1936-0614. JSTOR3872578.