Kuiper, L. (1994). Architechural Analysis of Douglas-Fir Forests. Hagg: CIP-Data Kooninklike Bibliotheek.
Dyfyniad Arddull ChicagoKuiper, L.C. Architechural Analysis of Douglas-Fir Forests. Den: Hagg: CIP-Data Kooninklike Bibliotheek, 1994.
Dyfyniad MLAKuiper, L.C. Architechural Analysis of Douglas-Fir Forests. Hagg: CIP-Data Kooninklike Bibliotheek, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.