Trattner, Walter I., author
Free Press, 1984
Buku Teks
Trattner, Walter I., author
Free Press, 1979
Buku Teks
Cambridge University Press, 2017
eBooks
Reams, Bernard D.
William S. Hein & Co, 1989
Buku Teks
Anand, R.P.
Martinus Nijhoff Publishers, 1983
Buku Teks