Two penmanship books with easy to follow lessons.
Both are available at the IAMPETH website and also at this archive:
Italian book
French book
The Zanerian Manual is available for download here:
Zanerian Manual
Mac people may download Dr. Joe Vitolo's eBook at this link.
Vitolo eBook for Mac
PC people may download a PDF here:
PDF of Vitolo book
To watch his videos, if you are PC, you will find them at:
Vitolo videos