Sharma, Robin
The secret letters of the monk who sold his Ferrari
HarperElement, 2011
 Buku Teks
Deacon, Richard
The French secret service
Grafton Books, 1990
 Buku Teks
Adams, Gelnda
Letters from Yogya
Marege: Jurnal Pusat Kajian Australia, 1998
 Artikel Jurnal
Marx, Groucho
Groucho letters : letters from and to Groucho Marx
Simon and Schuster, 1967
 Buku Teks
O`Farrell, Patrick
Letters from Irish Australia, 1825-1929
New South Wales University Press, 1984
 Buku Teks