Feiffer, Peter, author
Leipzig, 1969
Buku Teks
Matthews, G.A.
"London: Longman Scientific and Technical, 1988",
Buku Teks
Fajaria Nurcandra, author
Universitas Indonesia, 2018
Artikel Jurnal
Artikel Jurnal
Barley, K. P., author
Australian Vice Chancellors Commite, 1975
Buku Teks