Wolff, John U., Beginning Cebuano, Parts I and II. New Haven: Yale University Press, 1966, 1967.
Wolff, John U., ‘The Classification of Cebuano Verbs’, Philippine Journal of Linguistics, Vol. I, No. 1, 1970.
FLORA AND FAUNA
BIRDS
Delacour, Jean T., and Ernst Mayr, Birds of the Philippine Islands. New York: The Macmillan Co., 1946.
Hachisuka, The Hon. Masaiya, The Birds of the Philippine Islands. London: H. F. Witherby, 1931–1935.
Thomson, A. Landsborough, A New Dictionary of Birds. New York: McGraw-Hill, 1964.
FISHES AND SHELLFISHES
Abbott, R. Tucker, Sea Shells of the World. New York: Golden Press, 1962.