APA (7th ed.) Citation

Schaller, H., Comati, S., & Krauß, R. (2015). Bulgarien-Jahrbuch 2013. Peter Lang International Academic Publishing Group.

Chicago Style (17th ed.) Citation

Schaller, Helmut, Sigrun Comati, and Raiko Krauß. Bulgarien-Jahrbuch 2013. Bern: Peter Lang International Academic Publishing Group, 2015.

MLA (9th ed.) Citation

Schaller, Helmut, et al. Bulgarien-Jahrbuch 2013. Peter Lang International Academic Publishing Group, 2015.