Bennett, Arnold
Penguin Books, 1938
Buku Teks
Lock, Fred
Oxford University Press, 1977
Buku Referensi
Gor`kiy, Aleksey Maksimovich, author
Molodaya Gvardiya, 1963
Buku Teks
Treviño, Rose Zertuche, author
[American Library association, American Library association], 2006
eBooks
edited by Henrietta M. Smith
[American Management Association, ], 2009
eBooks