APA (7th ed.) Citation

Sinaga, M. S. (2011). Problem-Based Learning on Air Pollution Topic to Improve Senior High School Students' Concept Mastering and Critical Thinking.

Chicago Style (17th ed.) Citation

Sinaga, Marudur Sdnatha. Problem-Based Learning on Air Pollution Topic to Improve Senior High School Students' Concept Mastering and Critical Thinking. 2011.

MLA (9th ed.) Citation

Sinaga, Marudur Sdnatha. Problem-Based Learning on Air Pollution Topic to Improve Senior High School Students' Concept Mastering and Critical Thinking. 2011.

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