Gaya APA
Tan, T., Y., S., L., T., J., K. (2009).
Clean, green and blue: Singapore's journey towards environmental and water sustainability (-).
Germany:
.
Gaya MLA
Tan, T., Y., S., L., T., J., K..
Clean, green and blue: Singapore's journey towards environmental and water sustainability.
-
Germany:
,
2009.
Text.