Williams, E. F. (2015). Green giants: How smart companies turn sustainability into billion-dollar businesses. AMACOM - American Management Association.
Chicago-Zitierstil (17. Ausg.)Williams, E. Freya. Green Giants: How Smart Companies Turn Sustainability into Billion-dollar Businesses. New York: AMACOM - American Management Association, 2015.
MLA-Zitierstil (9. Ausg.)Williams, E. Freya. Green Giants: How Smart Companies Turn Sustainability into Billion-dollar Businesses. AMACOM - American Management Association, 2015.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.