Roos, Finky Feibra (2024) The effect of English club on students’ confidence in public speaking at SMAN 1 Puding Besar on academic year 2024/2025. Undergraduate thesis, Institut Agama Islam Negeri Syaikh Abdurrahman Siddik.

Indrawati, Indrawati and Noor, Wahyudin and Riadi, Iman and Fitriana, Riani and Utami, Resti Wahyu and Roos, Finky Feibra (2022) Investigating English as foreign language classroom management in Islamic High Schools in Bangka Belitung: Teachers' attitudes, beliefs, strategies and challenges. IAIN Syaikh Abdurrahman Siddik, Bangka. (Unpublished)