edited by J. Graham Beaumont
Grange Books, 1989
Buku Referensi
Dossey, Barbara Montgomery
J.B. Lippincott , 1992
Buku Teks
Campbell, Don G., 1946-
Quill, 2002
Buku Teks
Christ Billy Aryanto
2016
UI - Tesis Membership
Arnold, Stephanie
Mayfield Publishing Company, 2001
Buku Teks