For information on the Citrix certification, training providers and exams, see the Citrix certification Web site: http://www.citrix.com/training/cca_cert.htm.
Two books are recommended for self-study for the Citrix exam:
Harwood, Ted. Windows NT Terminal Server and Citrix MetaFrame (New Riders, 1998, ISBN: 1-56205-944-0).
Mathers, Todd W. Windows NT/2000 Thin Client Solutions: Implementing Terminal Services and Citrix MetaFrame (New Riders, 2000, ISBN: 1-57870-239-9).