Ranno Haruyama, Koubun Wakashima, Kohei Koiwa. Developing a motherhood regret scale: An examination of reliability, validity, and association withh basic attributes. med Rxiv. 2024
Kohei Koiwa, Mao Komatsu, Koubun Wakashima. Development of a Behavioral Scale toward People Who Fail at “Taking a Hint” and a Test of its Reliability and Validity. International Journal of Brief Therapy and Family Science. 2023. 13. 1. 32-42
Fumi Seki, Gen Takagi, Kohei Koiwa, Naoto Nihonmatsu, Koubun Wakashima. Typology of Conditional Self-acceptance in Association with Positivity and Stress Response. International Journal of Brief Therapy and Family Science. 2023. 13. 1. 6-14
Nihonmatsu, N, Okuyama, S, Kobayashi, D, Takagi, G, Sakamoto, K, Hagidai, M, Wakashima, K. Trends of Family Research in Japan. IAFP Newsletter. 2020. 33. Spring 2020. 13-18