Gaya APA
Maris, Amanda. (2007).
Challenges: workbook 2 .
Inggris:
Pearson Education.
Gaya Chicago
Maris, Amanda.
Challenges: workbook 2.
Inggris:
Pearson Education,
2007.
Text.
Gaya MLA
Maris, Amanda.
Challenges: workbook 2.
Inggris:
Pearson Education,
2007.
Text.
Gaya Turabian
Maris, Amanda.
Challenges: workbook 2.
Inggris:
Pearson Education,
2007.
Print.