APA (7th ed.) Citation

Bäcker, R., & Rak, J. (2021). Problem badawczy. Ksiegarnia Akademicka Publishing.

Chicago Style (17th ed.) Citation

Bäcker, Roman, and Joanna Rak. Problem Badawczy. Ksiegarnia Akademicka Publishing, 2021.

MLA (8th ed.) Citation

Bäcker, Roman, and Joanna Rak. Problem Badawczy. Ksiegarnia Akademicka Publishing, 2021.

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