Hodgson, Barbara B., author
W.B. Saunders, 1997
Buku Referensi
foreword by Kathleen Fletcher
Springhouse , 2000
Buku Referensi
Springhouse Corporation, 1997
Buku Referensi
Anderson, Philip O.
McGraw-Hill, 2001
Buku Referensi
Anderson, Philip O., editor
McGraw-Hill, 2002
Buku Referensi