Não informado. (1995). Phytologia Balcanica. Bulgarian Academy of Science, Institute of Biodiversity and Ecosystem Research.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Phytologia Balcanica. Sofia: Bulgarian Academy of Science, Institute of Biodiversity and Ecosystem Research, 1995.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Phytologia Balcanica. Bulgarian Academy of Science, Institute of Biodiversity and Ecosystem Research, 1995.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.