Gaya APA
Vital Signs : The Environmental Trends That Are Shaping Our Future. (1997).
New York:
W.W.Norton Company.
Gaya Chicago
Vital Signs : The Environmental Trends That Are Shaping Our Future.
Pertama.
New York:
W.W.Norton Company,
1997.
Text.
Gaya MLA
Vital Signs : The Environmental Trends That Are Shaping Our Future.
Pertama.
New York:
W.W.Norton Company,
1997.
Text.
Gaya Turabian
Vital Signs : The Environmental Trends That Are Shaping Our Future.
New York:
W.W.Norton Company,
1997.
Print.