Schaller, H., Comati, S., & Krauß, R. (2015). Bulgarien-Jahrbuch 2013. Peter Lang International Academic Publishers.
Chicago Style (17. basım) AtıfSchaller, Helmut, Sigrun Comati, ve Raiko Krauß. Bulgarien-Jahrbuch 2013. Bern: Peter Lang International Academic Publishers, 2015.
MLA (9th ed.) AtıfSchaller, Helmut, et al. Bulgarien-Jahrbuch 2013. Peter Lang International Academic Publishers, 2015.
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