Gaya APA
Tignor, R. et al
(2008).
Worlds together worlds apart
.
Inggris:
W.W. Norton & Company, Inc.
Gaya MLA
Tignor, Robert. et al.
"Worlds together worlds apart".
Inggris:
W.W. Norton & Company, Inc,
2008.
BUKU TEKS.