Jakarta : Universitas Nasional
Majalah, Jurnal, Buletin
Helmut Wautischer
Springer, 2012
eBooks
Singh, Karan
Oxfords University Press, 2003
Buku Teks
Roy Wood Sellars; V.J. McGill; Marvin Farber (editor)
Macmillan, 1949
Buku Teks
Taiwan : National Taiwan University
Majalah, Jurnal, Buletin