1. Minister of Education and Culture of The Republic of Indonesia. Regulation of The Minister of Education and Culture of The Republic of Indonesia Number 60 of 2014 Concerning the 2013 Curriculum for Vocational Middle School/Vocational Aliyah Madrasah. 2014.
2. Minister of Education and Culture of the Republic of Indonesia. Regulation of The Minister of Education, Education, and Culture of the Republic of Indonesia Number 70-year 2013 Concerning the Basic Framework and Curriculum Structure of Vocational Middle School/Madrasah Aliyah Vocational School, 2013.
3. Cloudia Ho, Y.-Y. Communicative language teaching and English as a foreign language undergraduates’ communicative competence in Tourism English. Journal of Hospitality, Leisure, Sport & Tourism Education 27, 100271, 2020.
4. Evropská, komise. Content and language integrated learning (CLIL) at school in Europe. (Eurydice), 2006.
5. Innovations and Challenges in CLIL Teacher Training