Gaya APA
Lifespan Development. (2012).
New Jersey:
Pearson Education Int..
Gaya Chicago
Lifespan Development.
6th ed..
New Jersey:
Pearson Education Int.,
2012.
Buku.
Gaya MLA
Lifespan Development.
6th ed..
New Jersey:
Pearson Education Int.,
2012.
Buku.
Gaya Turabian
Lifespan Development.
New Jersey:
Pearson Education Int.,
2012.
Buku.