By Richard Ibrahim Msuya
By Paschal Banga Nade
By Scholastika Albert Ngowi
By Japhet Methusela Mgema and Cyril Kalembana Komba
By Richard Ibrahim Msuya
By Abolaji, Olugbenga Bukki, Margaret Moronke, Dosunmu, Olugbenga, A. Akintola and Hakeem J. Edun
By Ismail J. Ismail
By Prosper J. Kimaro
By Alban D. Mchopa, Jackson M. William and Joseph M. Kimaro
By Kaula Stephen
By George Julius Babune
By Rashid A. Chikoyo
By Kihupi, M.L
By Erick R. Samwi
By Kaula Stephen
Reviewer Abswaidi Ramadhani