Gaya APA
Herrera, Mario, Pinkley, Diane. (2005).
Backpack 3 British English .
Singapore:
Pearson Education.
Gaya Chicago
Herrera, Mario, Pinkley, Diane.
Backpack 3 British English.
Singapore:
Pearson Education,
2005.
Text.
Gaya MLA
Herrera, Mario, Pinkley, Diane.
Backpack 3 British English.
Singapore:
Pearson Education,
2005.
Text.
Gaya Turabian
Herrera, Mario, Pinkley, Diane.
Backpack 3 British English.
Singapore:
Pearson Education,
2005.
Print.