Gaya APA
Covey, Stephen R. (1989).
The Seven habits of highly effective people : restoring the character ethic .
New York:
Simon and Schuster.
Gaya Chicago
Covey, Stephen R.
The Seven habits of highly effective people : restoring the character ethic.
New York:
Simon and Schuster,
1989.
Buku.
Gaya MLA
Covey, Stephen R.
The Seven habits of highly effective people : restoring the character ethic.
New York:
Simon and Schuster,
1989.
Buku.
Gaya Turabian
Covey, Stephen R.
The Seven habits of highly effective people : restoring the character ethic.
New York:
Simon and Schuster,
1989.
Buku.