Gaya APA
Tay, Beverly. (2007).
BIOLOGY INSIGHTS 'O' LEVEL .
Singapore:
pearson education limited.
Gaya Chicago
Tay, Beverly.
BIOLOGY INSIGHTS 'O' LEVEL.
Singapore:
pearson education limited,
2007.
Text.
Gaya MLA
Tay, Beverly.
BIOLOGY INSIGHTS 'O' LEVEL.
Singapore:
pearson education limited,
2007.
Text.
Gaya Turabian
Tay, Beverly.
BIOLOGY INSIGHTS 'O' LEVEL.
Singapore:
pearson education limited,
2007.
Print.