APA (7th ed.) Citation

Muscat, C., Dennis, J., & Knopińska, O. (2008). Umbria. Wydawnictwo RM.

Chicago Style (17th ed.) Citation

Muscat, Cathy, Jerry Dennis, and Olga Knopińska. Umbria. Warszawa: Wydawnictwo RM, 2008.

MLA (9th ed.) Citation

Muscat, Cathy, et al. Umbria. Wydawnictwo RM, 2008.

Warning: These citations may not always be 100% accurate.