If your students are reading the Narrative of the Life of Frederick Douglass, this is a great way to have students practice both argument and reflection in their writing. The first portion of their assignment is to make an argument tree map then write a reflection upon reading the chapter.
The assignment is tailored to accompany the book throughout its entirety.
This assignment comes with a rubric and links to samples as well. This model of reflections can be easily modified for any other reading.