Gaya APA
How Does It Happen?. (2004).
chicago:
World book.
Gaya Chicago
How Does It Happen?.
.
chicago:
World book,
2004.
Buku.
Gaya MLA
How Does It Happen?.
.
chicago:
World book,
2004.
Buku.
Gaya Turabian
How Does It Happen?.
chicago:
World book,
2004.
Buku.