Gaya APA
Leider, Richard J.. (1997).
The power of purpose .
USA:
MJF Books.
Gaya Chicago
Leider, Richard J..
The power of purpose.
USA:
MJF Books,
1997.
Text.
Gaya MLA
Leider, Richard J..
The power of purpose.
USA:
MJF Books,
1997.
Text.
Gaya Turabian
Leider, Richard J..
The power of purpose.
USA:
MJF Books,
1997.
Print.