Roger B. Knowles & Emile J Langley 
Psychology of Sadness [PDF ebook] 

In this book, the authors present current research in the study of the psychology of sadness. Topics discussed include the grieving process and living with persons with bipolar affective disorder; depression and pregnancy; children’s knowledge of the consequences of expressing sadness; the themes of sadness and frustration among returning combat veterans; and the perception and experience of sadness in music.