The sources should be purely academic papers, articles, and books.

I have attached a file with the instructions of the professor, which are clear and precise. Please do EXACTLY like what’s written in the instruction and use APA style; I only need three promising sources for the annotated bibliography. The sources should be purely academic papers, articles, and books. Follow the structure step by step as provided in the example (summarize, assess, reflect). Look for the causes and consequences of the Korean war for the bibliography.