Bryan, J.
McGraw-Hill Book Company, Inc., 1960
Buku Teks SO
Hammond, Robert Bruce
Robert B. Hammond, 1956
Buku Teks SO
Jacob, Alaric
Collins, 1944
Buku Teks SO
Horstmann, Lali
Houghton Miffiln, 1954
Buku Teks
compiled by the Youth Divison of Soka Gakkai; translated and edited by Richard L. Gage
Japan Times, 1982
Buku Teks SO