Gaya APA
Stephen, R Covey. ().
Principle-centred leadership .
Londen:
Simon.
Gaya Chicago
Stephen, R Covey.
Principle-centred leadership.
Londen:
Simon,
.
.
Gaya MLA
Stephen, R Covey.
Principle-centred leadership.
Londen:
Simon,
.
.
Gaya Turabian
Stephen, R Covey.
Principle-centred leadership.
Londen:
Simon,
.
.