I concur with Dr. Pappas. Especially now that libraries are more user friendly
than ever. One strategy is to start with a textbook (such as Schmidt &
Roberts' Foundations of Parasitology) and track down references [such as
beginning on page 97 (6th Edition)--in fact the first reference is "The biology
of Giardia"]. Another strategy is to use (for example) "Dialogue" and search
keywords in databases such as Biosis, SciSearch, Medline, etc. These are
pretty good...unless you need literature prior to about 30 years ago. Then,
you must find a library that has accessible copies of Biological Abstracts,
Zoological Record, Index Medicus, etc.
Whatever your status--high school student doing a project, graduate student
doing research, or just an interested bystander, you will benefit from the
above approaches much more than if I said "Check out Nash et al.'s 1990 paper,
Frequency of variant antigens in Giardia lamblia, IN: Experimental
Parasitology 71: 415-421.
Professor of Bioogy
Kentucky Wesleyan College