Gaya APA
Rubin, Gretchen. (2009).
The Happiness Projectt .
New York:
Harper Collins Publisher.
Gaya Chicago
Rubin, Gretchen.
The Happiness Projectt.
New York:
Harper Collins Publisher,
2009.
Buku.
Gaya MLA
Rubin, Gretchen.
The Happiness Projectt.
New York:
Harper Collins Publisher,
2009.
Buku.
Gaya Turabian
Rubin, Gretchen.
The Happiness Projectt.
New York:
Harper Collins Publisher,
2009.
Buku.