Nygård, R. (2000). Productivity of woody vegetation in Savanna woodlands in Burkina Faso. Swedish University of Agricultural Sciences.
Lua i Stíl Chicago (17ú heag.)Nygård, Robert. Productivity of Woody Vegetation in Savanna Woodlands in Burkina Faso. Umeå: Swedish University of Agricultural Sciences, 2000.
Lua MLA (8ú heag.)Nygård, Robert. Productivity of Woody Vegetation in Savanna Woodlands in Burkina Faso. Swedish University of Agricultural Sciences, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.