1. Adler, M., & Ziglio, E. (1996). Gazing into the oracle: The Delphi method and its application to social policy and public health. Jessica Kingsley Publishers.
2. Akkermans, H. A., Bogerd, P., Yücesan, E., & van Wassenhove, L. N. (2003). The impact of ERP on supply chain management: Exploratory findings from a European Delphi study. European Journal of Operational Research, 146, 284–301. https://doi.org/10.1016/S0377-2217(02)00550-7
3. Altenburg, T. (2007). Donor approaches to supporting pro-poor value chains. Report prepared for the donor committee for enterprise development working group on linkages and value chains. German Development Institute.
4. Asbridge, D. D. (1995). Soybeans vs. other vegetable oils as source of edible oil products. In D. R. Erickson (Ed.), Practical handbook of soybean and utilisation (pp. 1–8). AOCS Press.
5. Ash, M. S. (1992). Animal feeds compendium. USDA.