The Thracian treasure from Rogozen - Bogdan Nikolov
The Thracian culture in images
Thracian tumulus from the Roman period near Sofia by Daniela Agre, prepared by Hristo Tsenov (in Bulgarian)
The Varna Chalkolithic necropolis by Dr. Ivan Ivanov, prepared by Hristo Tsenov (in Bulgarian)
Thracian Ethnology by R. Georgieva et al. - summary in English