Takekawa, John, Shane R Heath, David C Douglas, William M Perry, Salim Javed, Scott H Newman, Rajendra N Suwal, et al. 2013. “Geographic Variation in Bar-Headed Geese Anser Indicus: Connectivity of Wintering Areas and Breeding Grounds across a Broad Front”. Wildfowl, April, 100-123. https://tidsskrift.dk/Wildfowl/article/view/153916.