APA-ийн эшлэл(7 дахь хэвлэлт)
Tulgan, B. (2014). The 27 challenges managers face: Step-by-step solutions to (nearly) all of your management problems. Jossey-Bass.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)
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 -ийн эшлэл (9 дэх хэвлэлт)
Tulgan, Bruce. The 27 Challenges Managers Face: Step-by-step Solutions to (nearly) All of Your Management Problems. Jossey-Bass, 2014.
Анхааруулга: Эдгээр ишлэлүүд үргэлж 100% үнэн зөв биш байж магадгүй.