Birds to watch : the ICBP world check-list of threatened birds Author(s) Collar, N. J. Andrew, P. Gonzaga, L. P. Grimmett, Richard Johnson, Timothy H. (Timothy Hugh) Stattersfield, A. J. Stuart, S. N.
Birds and people : bonds in a timeless journey Author(s) Collar, N. J. Long, Adrian J. Robles Gil, Patricio Rojo, Jaime
Birds to watch 2 : the world list of threatened birds Author(s) Collar, N. J. Crosby, M. J. Stattersfield, A. J.
Threatened birds of Asia Author(s) Collar, N. J. Andreev, A. V. Chan, S. Crosby, M. J. Subramanya, S. Tobias, J. A.
Threatened birds of the Philippines Author(s) Collar, N. J. Mallari, Neil Aldrin D. Tabaranza, Blas R.
Threatened birds of the Americas Author(s) Collar, N. J. Gonzaga, L. P. Krabbe, N. Madrono Nieto, A. Naranjo, L. G. Parker, Theodore A. Wege, David C.
