Hammond, A. (1998). Which world?: Scenarios for the 21st century. Washington: World Resources Institute.
शिकागो स्टाइल उद्धरणHammond, Allen. Which World?: Scenarios for the 21st Century. Washington: World Resources Institute, 1998.
एमएलए उद्धरणHammond, Allen. Which World?: Scenarios for the 21st Century. Washington: World Resources Institute, 1998.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.