Gaya APA
Harris, Michael, Mower, David. (2008).
Challenges Student's Book 1 (Cet 1).
New York:
Pearson Longman.
Gaya Chicago
Harris, Michael, Mower, David.
Challenges Student's Book 1.
Cet 1
New York:
Pearson Longman,
2008.
Text.
Gaya MLA
Harris, Michael, Mower, David.
Challenges Student's Book 1.
Cet 1
New York:
Pearson Longman,
2008.
Text.
Gaya Turabian
Harris, Michael, Mower, David.
Challenges Student's Book 1.
Cet 1
New York:
Pearson Longman,
2008.
Print.