1. Amerasinghe F P, Kulasooriya S A 1986. Azolla vs mosquitoes: some experiments with Culex quinquefasciatus. Mircen J., 2, 355–363.
2. Anonymous 1987. Crowing Azolla from spores. National Azolla Action Programme, University of the Philippines, Los Banos. 16 p.
3. Braemer P 1927. La culture des Azolla au Tonkin. Rev. Bot. Appl. Agric. Col., 7, 816–819.
4. Chevalier A 1926. La culture des Azolla pour la nourriture des animaux de basse-cour et comme engrais vert pour les rizières. Rev. Bot. Appl. Paris, 6, 356–360.
5. de Waha Baillonville T, Diara H F, Watanabe I, Berthet P, Van Hove C 1991. Assessment and attempt to explain the high performance of Azolla in subdesertic tropics versus humid tropics. Plant Soil, 137 (1), 145–150.