Gaya APA
Questions and answers;pengendalian pencemaran. (2009).
Mesir:
[s.n.].
Gaya Chicago
Questions and answers;pengendalian pencemaran.
.
Mesir:
[s.n.],
2009.
Text.
Gaya MLA
Questions and answers;pengendalian pencemaran.
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Mesir:
[s.n.],
2009.
Text.
Gaya Turabian
Questions and answers;pengendalian pencemaran.
Mesir:
[s.n.],
2009.
Print.