APA Style
Stephen Covey. (2001).
London:
Dorling Kindersley.
Chicago Style
Stephen Covey.
.
London:
Dorling Kindersley,
2001.
.
MLA Style
Stephen Covey.
.
London:
Dorling Kindersley,
2001.
.
Turabian Style
Stephen Covey.
London:
Dorling Kindersley,
2001.
.