Mulholland, Harry, author
Mulholland-Wirral, 1984
Buku Referensi
edited by Philip G. Altbach, Edith S. Hoshino
Fitzroy Dearborn, 1995
Buku Referensi
Peacock, Janet L., auhtor
Oxford University Press, 2007
Buku Teks
Murray, Katherine, 1961- author
Que, 1992
Buku Teks
Simone, Luisa, author
Microsoft Press, 1992
Buku Teks