What is the author's style in Roots by Alex Haley?

Roots is narrated by a third-person narrator. The device of a third-person narrator enables the text to change settings when the characters do. For example, when Kizzy is sold away from the Waller plantation, the narrative moves with her, recording her actions and thoughts on the Lea plantation. In this way the narrative moves from generation to generation, from Kunta Kinte to Bertha Palmer Haley.