Παραπομπή σε μορφή APA (7η εκδ.)

Nygård, R. (2000). Productivity of woody vegetation in Savanna woodlands in Burkina Faso. Swedish University of Agricultural Sciences.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Nygård, Robert. Productivity of Woody Vegetation in Savanna Woodlands in Burkina Faso. Umeå: Swedish University of Agricultural Sciences, 2000.

Παραπομπή σε μορφή MLA (8th εκδ.)

Nygård, Robert. Productivity of Woody Vegetation in Savanna Woodlands in Burkina Faso. Swedish University of Agricultural Sciences, 2000.