Damaris Kariuki and Florence Itegi (2020). TEACHER PARTICIPATION IN COLLABORATIVE PROFESSIONAL DEVELOPMENT AND LEARNERS ACHIEVEMENT IN KENYA. ISSN: 2320-5407. DOI: 10.21474/IJAR01/10715 . CiteFactor. https://citefactor.org/article/170546/teacher-participation-in-collaborative-professional-development-and-learners-achievement-in-kenya