Barnett, Mary, author
Grange Books, 1997
Buku Referensi
Bard, Kathryn A., author
Blackwell Publishing, 2008
Buku Teks
Ashton, Sally-Ann, author
Blackwell Publishing, 2008
Buku Teks
edited by Kathryn A. Bard ; editing assistance of Steven Blake Shubert
Routledge, 1999
Buku Referensi
Janssen, Jozef Marie Antoon
E.J. Brill, 1946
Buku Teks