*MARSHALL, R.C., 1934. - The Physiography and vegetation of Trinidad and Tobago. A study in plant ecology. Oxford Forestry Memoir 17, 56 p., 32 fig.
*MARSHALL, R.C., 1939. - Silviculture of the Trees of Trinidad and Tobago. British West Indies, Oxford Univ. Press., 247 p., illustr. London. *MARSHALL, R.C., 1939. - Silviculture of the trees of Trinidad and Tobago. Oxford Univ. Press, 247 p., 17 pl., London.
*MARTINEZ, 1928. - Plantas utiles de la Republica Mexicana