APA (7th ed.) Citation

Hawking, L., Hawking, S., & Bonk, F. (2013). Gregor a veľký tresk. SKN.

Chicago Style (17th ed.) Citation

Hawking, Lucy, Stephen Hawking, and František Bonk. Gregor a Veľký Tresk. Levoča: SKN, 2013.

MLA (9th ed.) Citation

Hawking, Lucy, et al. Gregor a Veľký Tresk. SKN, 2013.