Snape, Robert, author
Library Association , 1995
Buku Teks
Rose, Ernestine, author
Columbia University Press, 1954
Buku Teks
McColvin, Lionel R., author
UNESCO , 1986
Buku Teks
Brown, P.J., author
Cambridge University Press, 1977
Buku Teks
Rosen, Ellen Doree
Sage Publications, 1993
Buku Teks