Hrebenar, Ronald J.
Westview Press, 1986
Buku Teks
Maznah Mohamad, author
2018
Artikel Jurnal
Edited by Daniela Giannetti, Kenneth Benoit
Routledge Taylor & Francis Group, 2016
Buku Teks
Stockwin, J.A.A., author
Cambridge University Press , 1968
Buku Teks
Hrebenar, Ronald J
Westview Press, 1986
Buku Teks