Cao, Lei; Zhang, Yong; Barter, Mark; Lei, Gang (March 2010). "Anatidae in eastern China during the non-breeding season: Geographical distributions and protection status". Biological Conservation. 143 (3): 650–659. doi:10.1016/j.biocon.2009.12.001. ISSN0006-3207.
Chiba, Akira; Honma, Rhyuhei (2010). "Morphological and Behavioral Traits of a Wild Hybrid Eurasian Wigeon×Falcated Duck Male Found at Hyo-Ko Waterfowl Park, Niigata, Japan". Ornithological Science. 9 (2): 123. doi:10.2326/osj.9.123. S2CID86755012.
Chiba, Akira; Honma, Rhyuhei (2010). "Morphological and Behavioral Traits of a Wild Hybrid Eurasian Wigeon×Falcated Duck Male Found at Hyo-Ko Waterfowl Park, Niigata, Japan". Ornithological Science. 9 (2): 123. doi:10.2326/osj.9.123. S2CID86755012.
Cao, Lei; Zhang, Yong; Barter, Mark; Lei, Gang (March 2010). "Anatidae in eastern China during the non-breeding season: Geographical distributions and protection status". Biological Conservation. 143 (3): 650–659. doi:10.1016/j.biocon.2009.12.001. ISSN0006-3207.