The Crowd Is Untruth
Soren Kierkegaard was a 19th Century Danish philosopher. The Crowd Is Untruth is a very short essay, not a book.
Purity of Heart is to Will One Thing
Fear and Trembling
Selections from the writings of Kierkegaard
Either/Or: A Fragment of Life (Penguin Classics)
The Sickness Unto Death
Existentialism From Dostoevsky To Sartre
Memorable Quotations: Soren Kierkegaard
Fear and Trembling: Dialectical Lyric by Johannes De Silentio (Classics)
Dark Night of the Soul (Illustrated)