APA Style
Singapore Industrial Directory. (1991).
Singapura:
Promedia International PTE LTD.
Chicago Style
Singapore Industrial Directory.
.
Singapura:
Promedia International PTE LTD,
1991.
Text.
MLA Style
Singapore Industrial Directory.
.
Singapura:
Promedia International PTE LTD,
1991.
Text.
Turabian Style
Singapore Industrial Directory.
Singapura:
Promedia International PTE LTD,
1991.
Print.