APA (7th ed.) Citation

Urban, Z. Supernova 1993J v galaxii NGC 3031 (M81).

Chicago Style (17th ed.) Citation

Urban, Zdeněk. Supernova 1993J V Galaxii NGC 3031 (M81).

MLA (9th ed.) Citation

Urban, Zdeněk. Supernova 1993J V Galaxii NGC 3031 (M81).

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