The Concept of Anxiety
All of Kierkegaard's books have either a preface, dedication, or prayer at the beginning. This book includes a lengthy introduction. "The Concept of Anxiety" was published on exactly the same date as "Prefaces", June 17, 1844. Both books deal with Hegel’s idea of mediation. Mediation is a common thread throughout Kierkegaard’s works. His work up to this point was to show that faith was being mediated by knowledge. Here he takes up the questions of sin and guilt.
Hervey M. Cleckley
In 1941, Cleckley authored his magnum opus "The Mask of Sanity: An Attempt to Clarify Some Issues About the So-Called Psychopathic Personality". This became a landmark in psychiatric case studies and was repeatedly reprinted in subsequent editions. Cleckley revised and expanded the work with each edition published; the second American edition published in 1950 he described as effectively a new book.