Gaya APA
UNRUH, G. (2010).
EARTH, INC.: USING NATURE'S RULES TO BUILD SUSTAINABLE PROFITS .
Boston:
Harvard Business Press.
Gaya MLA
UNRUH, Gregory.
"EARTH, INC.: USING NATURE'S RULES TO BUILD SUSTAINABLE PROFITS".
Boston:
Harvard Business Press,
2010.
Textbook.