Essmann, H., & Pettenella, D. (2001). Forestry in Ukraine at the crossroads: Analyses and ideas for a Sustainable Development.
Lua i Stíl Chicago (17ú heag.)Essmann, Hans-Friedrich, agus Davide Pettenella. Forestry in Ukraine at the Crossroads: Analyses and Ideas for a Sustainable Development. 2001.
Lua MLA (9ú heag.)Essmann, Hans-Friedrich, agus Davide Pettenella. Forestry in Ukraine at the Crossroads: Analyses and Ideas for a Sustainable Development. 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.