Kuper, J. (1994). Sustainable development of scots pine forests. Wageningen Agricultural University.
Chicago Style aipamenaKuper, J.H. Sustainable Development of Scots Pine Forests. Netherlands: Wageningen Agricultural University, 1994.
MLA aipamenaKuper, J.H. Sustainable Development of Scots Pine Forests. Wageningen Agricultural University, 1994.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.