APA-referens

Py�sek, P., Cock, M. J. W., Nentwig, W. M., & Ravn, H. P. (2007). Ecology and management of giant hogweed (Heracleum mantegazzianum). CAB International.

Chicago-stil citat

Py�sek, Petr, M. J. W. Cock, W. M. Nentwig, och H. P. Ravn. Ecology and Management of Giant Hogweed (Heracleum Mantegazzianum). UK: CAB International, 2007.

MLA-referens

Py�sek, Petr, et al. Ecology and Management of Giant Hogweed (Heracleum Mantegazzianum). CAB International, 2007.