Solomon Bizuayehu Wassie, Hitoshi Kusakari, Sumimoto Masahiro. Inclusiveness and effectiveness of agricultural cooperatives: recent evidence from Ethiopia. INTERNATIONAL JOURNAL OF SOCIAL ECONOMICS. 2019. 46. 5. 614-630
Sung Bang Wook, Sumimoto Masahiro. Diversification of Rice Marketing Channel and Retail Business Strategy : A Case Study of Kometaro Corporation. 2003. 36. 95-102
Sumimoto Masahiro, Iba Haruhiko. Consumers' Valuations and Problems of a Farmers' Store : A Case Study of "Pascul Sanda" of Hyogo-Rokko Agricultural Cooperative. 2003. 36. 79-85
Iba Haruhiko, Sumimoto Masahiro. Factors Affecting Outsourcing of Agricultural Operations and Diversity of Regional Agricultural Organizations. 2003. 36. 19-28