Knoebl, Kuno
Frederick A. Praeger , 1967
Buku Teks SO
Jajasan Kebudajaan Sabar, 1965
Buku Teks SO
Rintoul, Stuart
William Heinemann Australia, 1987
Buku Teks SO
Tregaskis, Richard
Holt, Rinehart and Winston, 1963
Buku Teks SO
compiled by the Youth Divison of Soka Gakkai; translated and edited by Richard L. Gage
Japan Times, 1982
Buku Teks SO