Gaya APA
Butterworth, J., Thwaites, G.
(2005).
Thinking Skills
(
Cetakan Pertama)
.
Singpore:
CAMBRIDGE.
Gaya MLA
Butterworth, John., Thwaites, Geoff.
"Thinking Skills".
Cetakan Pertama
Singpore:
CAMBRIDGE,
2005.
Text.