Gaya APA
Covey, Stephen R.. (1990).
The 7 Habits of Highly Effective People: Powerful lessons in personal change .
New York:
Fireside.
Gaya Chicago
Covey, Stephen R..
The 7 Habits of Highly Effective People: Powerful lessons in personal change.
New York:
Fireside,
1990.
Text.
Gaya MLA
Covey, Stephen R..
The 7 Habits of Highly Effective People: Powerful lessons in personal change.
New York:
Fireside,
1990.
Text.
Gaya Turabian
Covey, Stephen R..
The 7 Habits of Highly Effective People: Powerful lessons in personal change.
New York:
Fireside,
1990.
Print.