Final Proofread for Young Non-Fiction Book

I'm seeking an experienced proofreader for a 27,000-word non-fiction book targeted at a young audience. The ideal candidate will not only proofread for grammar and punctuation but also assist with enhancing the book's overall coherence and flow, ensuring the language is appropriate for the intended age group, and fact-checking information.

Key Responsibilities:
- Comprehensive proofreading of the manuscript
- Checking for overall coherence and flow
- Ensuring age-appropriate language
- Fact-checking information
- Adding citation details and reference list

The book has been written in accordance with APA Style, so familiarity with this style guide is essential. The tone of the book is friendly and engaging, so I am looking for someone who can help maintain this tone throughout.

Ideal skills and experience:
- Proven experience proofreading non-fiction books
- Experience working on books for young audiences
- Familiarity with APA Style
- Excellent fact-checking skills
- Ability to maintain a friendly and engaging tone