Gaya APA
Collie, J., Slater, S. (2005).
Sepaking : student's book/ Joanne Collie .
Cambidge:
Cambrdige University Press.
Gaya MLA
Collie, Joanne., Slater, Stephen.
"Sepaking : student's book/ Joanne Collie".
Cambidge:
Cambrdige University Press,
2005.
Text.