For the use of dictionaries and other extraneous materials

[Keith McMullen]

Nabokov is famous for calling his dictionary his "traveling companion" 
and for listing it as one of the basic tools of good readership. Even in 
this splendid essay on inspiration, in which he says quite a bit about 
how he "does it," look what he uses as epigraphs (four dictionary 
definitions):

http://lib.ru/NABOKOW/Inspiration.txt