Worwood, Valerie Ann
Bantam Books, 1990
Buku Referensi
Lawless, Julia, author
Kyle Cathie, 1995
Buku Teks
Lawless, Julia, author
Element, 1992
Buku Referensi
Buckle, Jane, author
Elsevier, 2015
Buku Teks
Schnaubelt, Kurt, author
Healing Arts Press, 2011
Buku Teks