Peter Salim, author
Modern English Press, 1993
Buku Referensi
Collin, P. H., author
Peter Collin Publishing, 2001
Buku Teks
Pass, Chirtopher, author
Erlangga, 1997
Buku Referensi
Oxford reference
Oxford University Press, 1990
Buku Referensi
Lazarus, Harold
Philosophical Library, 1957
Buku Teks