Zoological Institute of Russian Academy of Sciences (St.Petersburg, Russia) presents information on morphology, biology, distribution and importance of fleas (Class Insecta: Order Siphonaptera). www.zin.ru/Animalia/Siphonaptera
Ohio State University Extension fact sheet about fleas, including a species list and information about life cycle and control. ohioline.osu.edu/hyg-fact/2000/2081.html