Shera, Jesse H.
Becker and Hayes, 1972
Buku Referensi
editors by Maurice Line; Graham Mackenzie; John Feather
Bowker Saur, 1996
Buku Teks
Anuar, Hedwig, author
Gower , 1985
Buku Teks
Clair, Guy St., author
Bowker, 1996
Buku Teks
edited by Elizabeth M. Moys
Westview Press, 1976
Buku Teks