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Boadu, Paul, Aidoo, Robert, Ohene-Yankyera, Kwasi, Kleih, Ulrich, Abdoulaye, Tahirou, Orchard, John and Maroya, Norbert (2019) A latent class modelling approach to evaluating farmers’ preferences for pona seed yam certification systems and their willingness to pay in Ghana. International Journal of Agricultural Extension and Rural Development Studies, 6 (1). pp. 1-25. ISSN 2058-9093 (Print), 2058-9107 (Online)