The student included three to five supporting documents, having provided five relevant sources that enhance the analysis of Vietnam Airlines' performance. All supporting documents are contemporary, published within the last three years, and labeled clearly for easy identification. The documents are relevant and sufficiently in-depth, providing a comprehensive understanding of the strategic implementation and financial implications for Vietnam Airlines. However, the student did not highlight specific parts of the documents that relate directly to the IA, nor did they assess the validity and reliability of the sources used.