| Reliability and validity of Japanese versions of the Flourishing Scale and the Scale of Positive and Negative Experience K Sumi Social Indicators Research 118, 601-615, 2014 | 204 | 2014 |
| Optimism, social support, stress, and physical and psychological well-being in Japanese women K Sumi Psychological reports 81 (1), 299-306, 1997 | 106 | 1997 |
| Relationship between neurotic perfectionism, depression, anxiety, and psychosomatic symptoms: A prospective study among Japanese men K Sumi, K Kanda Personality and Individual Differences 32 (5), 817-826, 2002 | 92 | 2002 |
| Reliability and validity of the Japanese version of the Perceived Stress Scale K Sumi Japanese Journal of Health Psychology 19 (2), 44-53, 2007 | 55 | 2007 |
| Optimism, Type A behavior, and psychological well-being in Japanese women K Sumi, K Horie, S Hayakawa Psychological Reports 80 (1), 43-48, 1997 | 39 | 1997 |
| Reliability and construct validity of the Gratitude Questionnaire 6 Item Form (GQ 6) in a sample of Japanese college students K Sumi Journal of Positive School Psychology 1 (2), 73-84, 2017 | 31 | 2017 |
| Temporal stability of the Japanese versions of the Flourishing Scale and the Scale of Positive and Negative Experience K Sumi Journal of Psychology and Psychotherapy 4 (2), 4:140, 2014 | 28 | 2014 |
| Relationships of social problem-solving ability with interpersonal relationships: a prospective study among Japanese women and men K Sumi Psychological Reports 111 (3), 929-937, 2012 | 25 | 2012 |
| The Japanese version of the revised Life Orientation Test: Reliability and construct validity K Sumi Psychological Reports 95 (1), 86-88, 2004 | 25 | 2004 |
| Measurement invariance of the scale of positive and negative experience across 13 countries V Jovanović, M Joshanloo, M Martín-Carbonell, C Caudek, B Espejo, ... Assessment 29 (7), 1507-1521, 2022 | 24 | 2022 |
| Teaching and learning Arabic in Japan AM Sumi, K Sumi Handbook for Arabic Language Teaching Professionals in the 21st Century, 20-37, 2018 | 17 | 2018 |
| Relations of social problem solving with interpersonal competence in Japanese students K Sumi Psychological Reports 109 (3), 976-982, 2011 | 16 | 2011 |
| Type A behavior, social support, stress, and physical and psychological well-being among Japanese women K Sumi Psychological reports 83 (2), 711-717, 1998 | 12 | 1998 |
| Orientations among Japanese University Students Learning Arabic (< Special Feature> Teaching and Learning Arabic) K SUMI, AM SUMI Annals of Japan Association for Middle East Studies 31 (2), 115-150, 2016 | 11 | 2016 |
| Correlations between optimism and social relationships K Sumi Psychological reports 99 (3), 938-940, 2006 | 11 | 2006 |
| The Japanese translation of the Life Engagement Test: Reliability and construct validity in a college student population and a working adult population K SUMI International Journal of Psychology and Behavior Analysis 4 (1), IJPBA-136, 2018 | 9 | 2018 |
| Interest in Arabic Culture among Arabic Language Students in Japanese Universities (< Special Feature> Teaching and Learning Arabic) AM SUMI, K SUMI Annals of Japan Association for Middle East Studies 31 (2), 151-182, 2016 | 8 | 2016 |
| Development of the Interest in Arabic Culture Scale (IACS): A Measure of Interest in Arabic Culture for Students Learning Arabic in Japanese Universities K Sumi, AM Sumi Journal of Psychology & Psychotherapy 5 (3), 5:180, 2015 | 8 | 2015 |
| Reliability and construct validity of the Japanese version of the Interpersonal Relationship Inventory K Sumi Perceptual and motor skills 97 (1), 135-140, 2003 | 8 | 2003 |
| Neurotic perfectionism, perceived stress, and self-esteem among Japanese men: a prospective study K Sumi, S Tsuzuki, K Kanda Psychological reports 88 (1), 19-22, 2001 | 8 | 2001 |
