Seven basic habits of highly effective people.

Manylion Llyfryddiaeth
Awdur Corfforaethol:	Steven R. Covey & Associates
Fformat:	Llyfr
Iaith:	English
Cyhoeddwyd:	[Salt Lake City, UT] Stephen R. Covey & Associates ©1988.
Pynciau:	Success > Psychological aspects. Success. Self-actualization (Psychology)