Heart of Darkness - tutorial, study guide, and resources
http://www.mantex.co.uk/heart-of-darkness/
This compilation of teaching and study resources will give students a great jumping off point for research into different analyses and perspectives of the text.
“Heart of Darkness” Resources Page
http://www1.chapman.edu/~ruppel/HeartofDarknessResources.htm
This list of web resources provides additional historical and contemporaneous research content for students to better understand the background for the novel.
Moving Beyond "Huh?": Ambiguity in Heart of Darkness
http://teachers.yale.edu/curriculum/viewer/initiative_13.02.01_u
A paper evaluating deeper analysis...