edited by Frederick W. Stehr
Kendall/Hunt, 1987
Buku Teks
Chu, Hung-fu, 1913-
Wm.C. Brown Communication, 1992
Buku Teks
Wigglesworth, V.B.
Worth, 1964
Buku Teks
Chapman, R.F. (Reginald Frederick)
Cambridge University Press, 2013
Buku Teks
editors, Tim Halliday, Kraig Adler, Christopher O'toole
Grolier International, 1993
Buku Referensi