Gaya APA
Rubin, Gretchen Craft. (2009).
Happiness project (1).
New York:
HarperCollins Publishers.
Gaya Chicago
Rubin, Gretchen Craft.
Happiness project.
1
New York:
HarperCollins Publishers,
2009.
Text.
Gaya MLA
Rubin, Gretchen Craft.
Happiness project.
1
New York:
HarperCollins Publishers,
2009.
Text.
Gaya Turabian
Rubin, Gretchen Craft.
Happiness project.
1
New York:
HarperCollins Publishers,
2009.
Print.