Ambasht, R.S. . Textbook of plant ecology / by R.S. Ambasht; N.K. Ambasht. - 13th ed / - Delhi : CBS Publishers & Dishtributors , 2000 - xii, 420p : ISBN: 81-239-0639-0 Subjects--Topical Terms: Botany Dewey Class. No.: G:5 / P0