Gaya APA
Helder, Chris. (2016).
Useful Belief .
s.l.:
Wiley.
Gaya Chicago
Helder, Chris.
Useful Belief.
s.l.:
Wiley,
2016.
Text.
Gaya MLA
Helder, Chris.
Useful Belief.
s.l.:
Wiley,
2016.
Text.
Gaya Turabian
Helder, Chris.
Useful Belief.
s.l.:
Wiley,
2016.
Print.