1. FD. (2016). Directorate of forestry.
http://www.mpzzs.gov.rs/registri-pumskih-semenskih-objekata/
. Visited: January 25, 2016.
2. INC. (2016). Institute for nature conservation of Serbia.
http://www.zzps.rs/novo/index.php?jezik=sr&strana=zastita_prirode_osnovni_podaci
. Visited: January 11, 2016.
3. INC. (2016a). Institute for nature conservation of Serbia.
http://www.zzps.rs/novo/index.php?jezik=sr&strana=zastita_prirode_zp_np_fruska_gora
. Visited: January 13, 2016.
4. INC. (2016b). Institute for nature conservation of Serbia.
http://www.zzps.rs/novo/index.php?jezik=sr&strana=zastita_prirode_zp_np_kopaonik
. Visited: January 13, 2016.
5. INC. (2016c). Institute for nature conservation of Serbia.
http://www.zzps.rs/novo/index.php?jezik=sr&strana=zastita_prirode_zp_np_tara
. Visited:January 13, 2016.