Chen, James C. P.
Wiley, 1985
Buku Referensi
Pergamon Press, 1978
Buku Teks
William Bright, editor-in-chief
Oxford University Press, 1992
Buku Referensi
Americana Corporation, 1960
Buku Referensi
edited by David L. Sills
Macmillan and The Free Press, 1968
Buku Referensi