Polak, P., & Warwick, M. (2013). The business solution to poverty: Designing products and services for three billion new customers. Berrett-Koehler Publishers, Inc..
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Čikaški stil citiranja (17. izdanje)
Polak, Paul, i Mal Warwick. The Business Solution to Poverty: Designing Products and Services for Three Billion New Customers. San Francisco: Berrett-Koehler Publishers, Inc., 2013.
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MLA način citiranja (9. izdanje)
Polak, Paul, i Mal Warwick. The Business Solution to Poverty: Designing Products and Services for Three Billion New Customers. Berrett-Koehler Publishers, Inc., 2013.
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