Gregory, G. R. (1987). Resource economics for foresters. John Wiley and Sons.
Chicago-čujuhus (17. p.)Gregory, G. Robinson. Resource Economics for Foresters. New York: John Wiley and Sons, 1987.
MLA-čujuhus (9. p.)Gregory, G. Robinson. Resource Economics for Foresters. John Wiley and Sons, 1987.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.