Gaya APA
Black, O., Bailey, S.
(2014).
Mind Gym : Achieve More by Thingking Differently
.
New York:
HarperOne.
Gaya MLA
Black, Octavius., Bailey, Sebastian.
"Mind Gym : Achieve More by Thingking Differently".
New York:
HarperOne,
2014.
FIC.