Muthenge E. et al. New Progresive Primary English Grade 1 Learners' Book E. Mathenge and T. Koundeng - 1st ed. - Nairobi ; Jomo Kenyatta Foundation , 2018 . - iv, 92 p. ; Col. Illustrations , 17 cm. ISBN: 978-9966-51-123-2 Dewey Class. No.: 420