The best all-around English-language books covering workplace mobbing and workplace bullying are Mobbing: Emotional Abuse in the American Workplace and The Bully at Work. The Davenport book Mobbing draws upon the groundbreaking research and publications by Heinz Leymann, a native German and naturalized Swede who published mainly in Swedish and German. Leymann's publications are more theoretical and clinical in nature and Davenport's book, while including basic theory, is more of a self-help book. The Bully at Work includes theory about how and why bullying occurs, but this is also a self-help book for targets. While there are few books in English on mobbing as a distinct phenomenon, many books on bullying are available. Some are better than others and most are variations on the same theme.
Davenport, Noa, Ruth Distler Schwarz, & Gail Pursell Elliot, Mobbing: Emotional Abuse in the American Workplace. Ames, IA: Civil Society Publishing, 2002.
Gravois, John, "Mob Rule." Chronicle of Higher Education 52 (32) (April 14, 2006) p. A10-A12.
Hannabuss Stuart, “Bullying at Work.” Library Management 19 (5) (1998), p. 304–310.
Hecker, Thomas E, “Workplace Mobbing: A Discussion for Librarians.” Journal of Academic Librarianship 33 (4) (July 2007) p. 439-45.
Leiding, Reba, "Mobbing in the Library Workplace: What it is and how to Prevent it." College and Research Libraries News (July/August 2010), p. 364-366, 384.
Leymann, Heinz , "The Content and Development of Mobbing at Work." European Journal of Work and Organizational Psychology 5 (2) (1996) p. 165-184.
---. "Mobbing and Psychological Terror at Workplaces." Violence and Victims 5 (2) (1990) p. 119-126.
Namie, Gary & Ruth Namie, The Bully at Work. Naperville, IL: Sourcebooks, 2009, 2nd ed.
Westhues, Kenneth, ed. Winning, Losing, Moving on: How Professionals Deal With Workplace Harassment and Mobbing. Lewiston, NY: Edwin Mellen Press, 2005.
---. Workplace Mobbing in Academe: Reports from Twenty Universities. Lewiston, NY: Edwin Mellen Press, 2004.