Estilo APA
GCE O Level English language (Yearly). (1998).
:
GCE.
Estilo Chicago
GCE O Level English language (Yearly).
.
:
GCE,
1998.
Text.
Estilo MLA
GCE O Level English language (Yearly).
.
:
GCE,
1998.
Text.
Estilo Turabian
GCE O Level English language (Yearly).
:
GCE,
1998.
Print.