1. 1. Ogawa H. Species and distribution of seagrasses in the Visayas, Philippines. In Umezaki I (ed) Scientific Survey of Marine Algae and their Resources in the Philippine Island. 1987, pp. 42-49.
2. 2. Ogawa H. Seagrasses of Palawan and Mindanao, Philippines. In Umezaki I (ed) Scientific Survey of Marine Algae and their Resources in the Philippine Island. 1989, pp. 58-64.
3. 3. Svedelius N. On the life history of Enhalus acoroides ( a contribution to the ecology of the hydrophilous plants). Ann. R. bot. Grnds. 1904; 2: 267-297.
4. 4. Troll W. Botanische Mitteilungen aus den Tropen. II. Zur Morphologic und Biologic von Enhalus acoroides (Linn. f.) Rich. Flora, Jena, 1931; 125: 427-456.
5. 5. den Hartog, C. The sea-grasses of the world. North-Holland Publishing Company, Amsterdam, 1970, pp.214-222.