Nygård, R. (2000). Productivity of woody vegetation in Savanna woodlands in Burkina Faso. Swedish University of Agricultural Sciences.
Chicago-referens (17:e uppl.)Nygård, Robert. Productivity of Woody Vegetation in Savanna Woodlands in Burkina Faso. Umeå: Swedish University of Agricultural Sciences, 2000.
MLA-referens (8:e uppl.)Nygård, Robert. Productivity of Woody Vegetation in Savanna Woodlands in Burkina Faso. Swedish University of Agricultural Sciences, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.