I swear by Apollo (2002) is the sequel to The River and the Source. For more works by Ogola, see: Cardinal Otunga: A Gift of Grace with Margaret Roche (1999), Place of Destiny (2005), and Mandate of the People (2012).
For further reading on colonialism and post-colonialism in Africa consider: Chinua Achebe's Things Fall Apart (1958), Okot p'Bitek's Song of Lawino and Song of Ocol (1984), Majprie Oludge MacGoye's Coming to Birth (1986), Tsitsi Dangarembga's Nervous Condition (1988), Meja Mwangi's The Mzungu Boy (1995), and Beverley Naidoo's Burn My Heart (2007).
Other scholarly works focusing on colonialism include: Aime Cesaire's Discourse on Colonialism (1950), Albert Memmi's The...