Oxford reference
Oxford University Press, 1990
Buku Referensi
Kurian, George Thomas
[American Management Association, ], 2013
eBooks
Kurian, George Thomas
Amacom, 2013
Buku Referensi
Bird, Roger
Sweet & Maxwell, 1983
Buku Teks
Fowler, H. W. (Henry Watson), 1858-1933
Buku Teks