A. C. Bent, 1926, _U. S. Natl. Mus. Bull._ 135, p. 109 (great
blue heron). W. P. Baldwin, 1946, _Auk_, Vol. 63, p. 589 (oyster
catcher). G. Mackay, 1929, _Auk_, 46, p. 123 (goldfinch). D.
Bannerman, 1936, _Birds Tropical West Africa_, Vol. 4, p. 244
(dusky flycatcher).