Gaya APA
Rubin, gretchen. (2015).
The happiness project .
New York:
HarperCollins.
Gaya Chicago
Rubin, gretchen.
The happiness project.
New York:
HarperCollins,
2015.
Text.
Gaya MLA
Rubin, gretchen.
The happiness project.
New York:
HarperCollins,
2015.
Text.
Gaya Turabian
Rubin, gretchen.
The happiness project.
New York:
HarperCollins,
2015.
Print.