Gaya APA
Jones, M, F, D, S, D. (2013).
Cambridge Checkpoint Science Coursebook 9 .
INGGRIS:
Cambridge University Press.
Gaya MLA
Jones, Mary;, Fellowes-Freeman,, Diane;, Sang,, David.
"Cambridge Checkpoint Science Coursebook 9".
INGGRIS:
Cambridge University Press,
2013.
Text.