Gaya APA
Spiral One. (1982).
Singapore:
Book Emporium Singapore PTE LTD.
Gaya Chicago
Spiral One.
.
Singapore:
Book Emporium Singapore PTE LTD,
1982.
Non Fiksi.
Gaya MLA
Spiral One.
.
Singapore:
Book Emporium Singapore PTE LTD,
1982.
Non Fiksi.
Gaya Turabian
Spiral One.
Singapore:
Book Emporium Singapore PTE LTD,
1982.
Non Fiksi.