Lawrence, L. de K.
1953. Nesting life and behavior of the Red-eyed Vireo. Can. Field-Nat., 67:46-77.
Lewis, H. F.
1921. A nesting of the Philadelphia Vireo. Auk, 38:26-44, 185-202.
Linsdale, J. M.
1928. Birds of a limited area in eastern Kansas. The Univ. of Kansas, Sci. Bull., 18:11:517-626.
Lloyd, W.
1887. Birds of Tom Green and Concho Counties, Texas. Auk, 4:181-193, 289-299.
Morris, D.
1956. The feather postures of birds and the problem of the origin of social signs. Behaviour, 9:75-113.