Duoforce Enterprises, Inc.

year of pub­li­ca­ti­onISBNauthor(s)title
1996978-0-9648839-0-1Lillian D. BjorsethBreakthrough Networking: Building Relationships That Last
2003978-0-9648839-3-2   ''Breakthrough Networking: Building Relationships That Last, Second Edition
2009978-0-9648839-4-9   ''Breakthrough Networking: Building Relationships That Last (Third Edition)