Gaya APA
Tas Annual Report 1997-1998. (1998).
Singapore:
TAS,Telecommunication Authority of Singapore.
Gaya Chicago
Tas Annual Report 1997-1998.
.
Singapore:
TAS,Telecommunication Authority of Singapore,
1998.
Monograf.
Gaya MLA
Tas Annual Report 1997-1998.
.
Singapore:
TAS,Telecommunication Authority of Singapore,
1998.
Monograf.
Gaya Turabian
Tas Annual Report 1997-1998.
Singapore:
TAS,Telecommunication Authority of Singapore,
1998.
Monograf.