Some of Ms. Shepherd's books are now out of print:
Borders for Calligraphy
Capitals for Calligraphy
Calligraphy Projects
Calligraphy Projects for Pleasure and Profit
Basics of the New Calligraphy
Basics of Left-handed Calligraphy
Calligraphy for Celebrating
Your Wedding
Calligraphy for Celebrating
Your Newborn
Calligraphy Now [published in the UK as A Manual of Modern Calligraphy]
Use these online bookstore links to help you search on the Web:
You may also be able to find these titles at your local bookstore, and they are definitely worth searching for!