Gaya APA
Gray, M, L, P, J, S.
(2008).
Exploring Science: How Science Works 7
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London:
Pearson Longman.
Gaya MLA
Gray, Mark, Levesley,, Penny, Johnson,, Steve.
"Exploring Science: How Science Works 7".
London:
Pearson Longman,
2008.
Text.