David A. Adler 
Picture Book of Frederick Douglass [EPUB ebook] 

"Adler, a prolific children’s book author, has done a good job describing the trajectory of Douglass’s life as he moved from being a slave himself to being a freer of slaves and a tireless civil rights activist. Narrator Charles Turner, who has a deep and resonant voice, uses just the right matter-of-fact yet serious tones that won’t overwhelm young listeners but will make an impression on them." -Audio File