APA-referens (7:e uppl.)
Tulgan, B. (2014). The 27 challenges managers face: Step-by-step solutions to (nearly) all of your management problems. Jossey-Bass.
Chicago-referens (17:e uppl.)
Tulgan, Bruce. The 27 Challenges Managers Face: Step-by-step Solutions to (nearly) All of Your Management Problems. San Francisco, California: Jossey-Bass, 2014.
MLA-referens (9:e uppl.)
Tulgan, Bruce. The 27 Challenges Managers Face: Step-by-step Solutions to (nearly) All of Your Management Problems. Jossey-Bass, 2014.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.