Peter J Glassman, Language and Being. Joseph Conrad and the Literature of Personality, Colombia University Press, 1976.
Chapter 6 develops a philosophically tinged argument about the relation between language and death in Heart of Darkness.
Eloise Knapp Hay, The Political Novels of Joseph Conrad, Chicago University Press, 1963, pp. 107-161.
The author relates the political component of Heart of Darkness to its stylistic techniques.
Douglas Hewitt, Conrad, A Reassessment, Bowes, 1952. Chapter 2 treats Heart of Darkness together with the other early tales which also have Marlow as their narrator.
Stephen K Land, Paradox and Polarity in the Fiction of Joseph Conrad, St. Martin's Press, 1984.
A 311-page book in which Stephen Land takes a critical look at several of Conrad's works, including Heart of Darkness and Nostrorno Land pays.....
