Carroll, John
The Taunton Press, 1998
Buku Teks
Brown, Gordon
Prestasi Pustakaraya, 2009
Buku Teks
Ramsey, Charles George, 1884-1963
John Wiley & Sons, 1998
Buku Teks
Mzia Razmadze, editor; Lali Jokhadze, Translator
Tsigni Eri, 2012
Buku Teks
Cornog, Mary Wood
Merriam-Webster Inc., 1994
Buku Referensi