Principle-centered leadership /

Ижил төстэй зүйлс

• Principle-centered leadership /
  -н: Covey, Stephen R.
  Хэвлэсэн: (1991)
• The 7 habits of highly effective people /
  -н: Covey Stephen R.
  Хэвлэсэн: (2004)
• The 7 habits of highly effective people /
  -н: Covey Stephen R.
  Хэвлэсэн: (2004)
• The success principles : how to get from where you are to where you want to be /
  -н: Canfield, Jack
  Хэвлэсэн: (2005)
• The success principles : how to get from where you are to where you want to be /
  -н: Canfield, Jack
  Хэвлэсэн: (2005)