Sovian Aritonang, author
Indonesia Defense University, 2019
Artikel Jurnal
Hosford, William F., author
Cambridge University Press , 2012
Buku Teks
Pounds, Norman J. G., author
Hutchinson University Library, 1969
Buku Teks
by Alison Rieser ... [and others]
West Academic Publishing, 2013
Buku Teks
Skelton, H.J., author
London, H.J.Skelton
Buku Teks