APA (7th ed.) Citation

Kašuba, R. What is simple but exciting mathematical problem? Vilnius University Press.

Chicago Style (17th ed.) Citation

Kašuba, Romualdas. What Is Simple but Exciting Mathematical Problem? Vilnius University Press.

MLA (9th ed.) Citation

Kašuba, Romualdas. What Is Simple but Exciting Mathematical Problem? Vilnius University Press.

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