1. Rijnbeek G van. Committee of Dutch scientist. The collected letters from Antoni van Leeuwenhoek, Part 3. Amsterdam: Swets & Zeitlinger, 1948:344-81.
2. Mank TG. Intestinal protozoa and diarrhoea in General Practice. Academisch Proefschrift. Amsterdam: Vrije Universiteit, 1997.
3. Farthing MJG. Giardiasis as a disease. In: Thompson RCA, Reynoldson JA, Lymbery AJ (eds). Giardia: from molecules to disease. Wallingform, UK: CAB, 1994:15-37.
4. Ish-Horowicz M, Korman SH, Shapiro M, Har Even U, Tamir I, Strauss N, et al. Asymptomatic giardiasis in children. J Pediatr Infect Dis 1989;8:773-9.
5. Markell EK, John DT, Krotoski. Lumen dwelling protozoa In: Markell and Voge's Medical Parasitology, 8th edition. Philadelphia, PA: WB Saunders Comp, 1999:56-62.