Ward, Barbara, author
Norton & Comp , 1957
Buku Teks
Hay, Stephen N.
Harvard University Press, 1970
Buku Teks
The John HopkinsPress, 1964
Buku Teks
Ikeda, Daisaku, 1928-, author
Founder of Soka University, [date of publication not identified]
Buku Teks
Pergamon Press, 1979
Buku Teks