Smith, Charles John
Bell and Sons, 1917
Buku Referensi
edited by Martin H. Manser
W & R Chambers, 1995
Buku Referensi
editor, Laurence Urdang
Macmillan Reference Books, 1995
Buku Referensi
Nandy, Milon
Composite Study Aid Publications, 1993
Buku Referensi
edited by G. Elgie Christ
Frederick Warne and Co, 1960
Buku Referensi