[1]
D. P. Collins, W. C. Conway, C. D. Mason, and J. W. Gunnels, “Winter diet of Blue-winged Teal Anas discors, Green-winged Teal Anas carolinensis, and Northern Shoveler Anas clypeata in east-central Texas”, Wildfowl, pp. 87–99, Nov. 2017.