Janiszewska, Dorota, i Luiza Ossowska. 2018. „Diversification of European Union Member States Due to the Production of Renewable Energy from Agriculture and Forestry”. Zeszyty Naukowe SGGW W Warszawie - Problemy Rolnictwa Światowego 18 (2):95-104. https://doi.org/10.22630/PRS.2018.18.2.37.