Sullivan, Karen, author
The Foundry, 2011
Buku Teks
Smyth, Angela, author
Thorsons, 1994
Buku Referensi
Lu, Henry C., author
Black Dog & Leventhal Publishing, Inc, 1999
Buku Teks
Elliot, Rose, author
Chapmans Publisher Ltd., 1994
Buku Referensi
Geddes & Grsset, 1997
Buku Teks