APA Style
Cunningham, ., Saigo, . (2001).
Enviromental Science A Global Concern sixth edition (Ke Enam).
America:
McGraw-HILL Higher Educaton.
MLA Style
Cunningham, ., Saigo, .
"Enviromental Science A Global Concern sixth edition".
Ke Enam
America:
McGraw-HILL Higher Educaton,
2001.
Text.