APA Style
Investigators. (1990).
Singapore:
Bookworm.
Chicago Style
Investigators.
First.
Singapore:
Bookworm,
1990.
printed.
MLA Style
Investigators.
First.
Singapore:
Bookworm,
1990.
printed.
Turabian Style
Investigators.
Singapore:
Bookworm,
1990.
printed.