Boulding, E., & Boulding, K. E. (1995). The future: Images and processes. Sage Publications.
Lua i Stíl Chicago (17ú heag.)Boulding, Elise, agus Kenneth E. Boulding. The Future: Images and Processes. Thousand Oaks, Calif.: Sage Publications, 1995.
Lua MLA (8ú heag.)Boulding, Elise, agus Kenneth E. Boulding. The Future: Images and Processes. Sage Publications, 1995.
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