Hakkila, P. (1989). Utilization of residual forest biomass. Springer Verlag.
Chicago Style aipamenaHakkila, P. Utilization of Residual Forest Biomass. Berlin: Springer Verlag, 1989.
MLA aipamenaHakkila, P. Utilization of Residual Forest Biomass. Springer Verlag, 1989.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.