Johansson, Ulf S; Ekman, Jan; Bowie, Rauri CK; Halvarsson, Peter; Ohlson, Jan I; Price, Trevor D; Ericson, Per GP (2013). "A complete multilocus species phylogeny of the tits and chickadees (Aves: Paridae)". Molecular Phylogenetics and Evolution. 69 (3): 852–60. doi:10.1016/j.ympev.2013.06.019. PMID23831453.
Axel Gebauer, Axel; Jürgen Jacob; Martin Kaiser; Siegfried Eck (2004). "Chemistry of the uropygial gland secretion of Hume's ground jay Pseudopodoces humilis and its taxonomic implications". Journal of Ornithology. 145 (4): 352–355. doi:10.1007/s10336-004-0030-0. S2CID66988.
Tang, S.; Ke, D.; Yu, T.; Wang, C.; Zhao, Q.; Fan, H.; Zhang, G.; Wang, C.; Lu, X. (2017). "Social organization, demography and genetic mating system of a Tibetan cooperative breeder". Ibis. 159 (1): 687–692. doi:10.1111/ibi.12485.
Johansson, Ulf S; Ekman, Jan; Bowie, Rauri CK; Halvarsson, Peter; Ohlson, Jan I; Price, Trevor D; Ericson, Per GP (2013). "A complete multilocus species phylogeny of the tits and chickadees (Aves: Paridae)". Molecular Phylogenetics and Evolution. 69 (3): 852–60. doi:10.1016/j.ympev.2013.06.019. PMID23831453.
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Axel Gebauer, Axel; Jürgen Jacob; Martin Kaiser; Siegfried Eck (2004). "Chemistry of the uropygial gland secretion of Hume's ground jay Pseudopodoces humilis and its taxonomic implications". Journal of Ornithology. 145 (4): 352–355. doi:10.1007/s10336-004-0030-0. S2CID66988.