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Chistilishte (Purgatory),
Izdatelska kushta "Niagolova", 1992, ISBN 978-954-8160-04-9 Vsichko:
Stikhotvoreniia (Everything),
Izdatelska kushta "Ivan Vazov"...
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srednovekovna Balgaria [Who is Who in
Medieval Bulgaria] (in Bulgarian). Sofia:
Izdatelska kashta "Petar Beron". p. 385. ISBN 978-954-402-047-7. Crampton, R .J....
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Medieval Bulgaria,
Izdatelska kashta "Petar Beron", Sofia, 1999, ISBN 954-402-047-0, pp. 311-312 Gyuzelev...
