Gaya APA
Rubin, Gretchen. (2018).
The Happiness Project (BI) (2019).
New York, USA:
Harper Collins Publisher.
Gaya Chicago
Rubin, Gretchen.
The Happiness Project (BI).
2019
New York, USA:
Harper Collins Publisher,
2018.
Text.
Gaya MLA
Rubin, Gretchen.
The Happiness Project (BI).
2019
New York, USA:
Harper Collins Publisher,
2018.
Text.
Gaya Turabian
Rubin, Gretchen.
The Happiness Project (BI).
2019
New York, USA:
Harper Collins Publisher,
2018.
Print.