BIRDS' NESTS AND THEIR SOUP
Gibson-Hill, 1948, Malay. Nat. Jour., Vol. 3, p. 190; F. H. Giles, 1935, Jour. Siam Soc. Nat. Hist. Suppl., Vol. 10, p. 137; and Jabouille, 1931, L'Oiseau et Rev. Franc. d'Ornith., Vol. 1, n.s., p. 219 (swiftlets).
WALLED WIVES OF HORNBILLS
R. E. Moreau, 1937, Proc. Zool. Soc. London, 1937, p. 331 (hornbills).
BURIED EGGS AND YOUNG
A. Newton, 1893, Dictionary of Birds, p. 733; and D. Bannerman, 1931, Birds Trop. West Africa, Vol. II, p. 205 (crocodile bird). Deusing, 1939, Auk, Vol. 56, p. 367 (grebe). Bent, 1925, U. S. Natl. Mus. Bull., 130, p. 98 (eider duck).
THE SNOWY OWL AS A TRADE INDEX
A. Gavin, 1947, Wilson Bull., Vol. 59, p. 202 (snowy owl).
MONKEY BIRDS
A. L. Rand, 1954, Fieldiana-Zoology (Chicago), Vol. 36, p. 23 (various "monkey-birds").