Nick Ashton-Jones, with Oronto Douglas and Susi Arnott, Niger Delta Ecosystems: the ERA Handbook… (1998)
“ An Agroforestry Handbook, a field guide for extension workers in the humid forest zone of Nigeria. 1992. DOUGLAS, O.N, AND ASHTON-JONES, N.J. The Human Ecosystem of the Delta: A Summary of the results of a preliminary baseline ecological participatory survey of the Niger Delta. Unpublished 1993. DUNN, JUSTINE. Cross River State Forestry Project (ODA Assisted) . An Agroforestry Handbook, a field guide for extension workers in the humid forest zone of Nigeria. 1992. ”
