Kenyatta, Jomo
Vintage Books, 1962
Buku Teks SO
edited by John Dunn
Cambridge University Press, 1979
Buku Teks SO
Webster, J.B.
Frederick A. Praeger, 1967
Buku Teks SO
Wright, Zachary Valentine
Brill, 2015
eBooks
Forrest, Joshua B.
Westview Press, 1992
Buku Teks SO