Wafula, Richard M. Nadharia za uhakiki wa fasihi / Richard M. Wafula, Kimani Njogu. - Nairobi : Jomo Kenyatta Foundation, 2007. - vi, 132 p. ; 21 cm. ISBN: 9966226311 LCCN: 2009349187 LC Class. No.: PN81 .W34 2007