Kessy, J. F. (1998). Conservation and utilization of natural resources in the east Usambara forest reserves: Conventional views and local perspectives. Wageningen Agricultural University.
Chicago-referens (17:e uppl.)Kessy, John Francis. Conservation and Utilization of Natural Resources in the East Usambara Forest Reserves: Conventional Views and Local Perspectives. Wageningen: Wageningen Agricultural University, 1998.
MLA-referens (8:e uppl.)Kessy, John Francis. Conservation and Utilization of Natural Resources in the East Usambara Forest Reserves: Conventional Views and Local Perspectives. Wageningen Agricultural University, 1998.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.