Mandela, Nelson, 1918-2013, author
Raben Prisma, 1994
Buku Teks
Bergstrom, Gunnel, author
Graduate School of Language and Culture, Osaka University, 2019
Artikel Jurnal
Goodwin, Doris Kearns, author
Compass Press, 1997.
Buku Teks
Till, William C.
Prentice-Hall, 1982
Buku Teks
Jaarsma, S.
Drukkerij de Toekomst, 1936
Buku Teks