Jorgensen, F. a. O. (2023). Cost studies in European forestry. Royal College of Forestry, Stockholm.
Chicago-čujuhus (17. p.)Jorgensen, Frits and Opheim. Cost Studies in European Forestry. Royal College of Forestry, Stockholm, 2023.
MLA-čujuhus (9. p.)Jorgensen, Frits and Opheim. Cost Studies in European Forestry. Royal College of Forestry, Stockholm, 2023.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.