* Birds of the Philippines (1958)
* Behavior and Breeding Biology of the Philippine Glossy Starling Aplonispanayensis (1962)
* Philippine Birds and Mammals (1968)
* Annotated Checklist of Philippine Birds (1977)
* Wildlife of the Philippines (1977)
* Guide to Philippine Flora and Fauna (1978)
* Conservation of Natural Resources in the Philippines (1980)
* Philippine Manual of Zoology Vol. 1 (1983)
* Philippine Birds: Their Identification, Distribution, and Status (1985)
* Birds of the Oriental Region (1986)
* Philippine Eagles: Their Biology and Ecology (1995)
* Wildlife: A Philippine Heritage (1997)
* Philippine Birds of Prey: Raptors and Falconidae (2000)
* Field Guide to the Birds of the Philippines (2001)
* Birds of the Philippines (2005)
* Philippine Raptors: A Field Guide to the Birds of Prey (2006)
Scientific articles
* "Ecological Relationships of the Birds of the Philippine Rice Field" (1957)
* "The Nesting Habits of the Philippine Glossy Starling" (1959)
* "The Behavior and Breeding Biology of the Philippine Glossy Starling" (1962)
* "The Taxonomy of the Philippine Glossy Starling" (1964)
* "A New Species of Flowerpecker from the Philippines" (1966)
* "The Birds of Marinduque Island, Philippines" (1966)
* "A New Species of Oriole from the Philippines" (1967)
* "The Birds of the Palawan Islands, Philippines" (1970)
* "A New Species of Warbler from the Philippines" (1971)
* "A New Species of Sunbird from the Philippines" (1972)
* "A New Species of Thrush from the Philippines" (1973)
* "A New Species of Flycatcher from the Philippines" (1974)
* "The Birds of the Mindoro Islands, Philippines" (1975)
* "A New Species of Crow from the Philippines" (1976)
Popular articles
* "Birds of the Philippines" (1957)
* "Philippine Birds and Mammals" (1968)
* "Wildlife of the Philippines" (1977)
* "Conservation of Natural Resources in the Philippines" (1980)
* "Wildlife: A Philippine Heritage" (1997)
* "Birds of the Philippines" (2005)
* "Philippine Raptors: A Field Guide to the Birds of Prey" (2006)