6Orenstein WA, Hinman AR. The immunization system in the United States-the role of school immunization laws [J]. Vac- cine, 1999, 17 (Supp| 3): S19-$24.
7Lester R, Nolan T. Proof of immunization status required for school entry [J]. Med J Aust, 1993, 159 (8) : 564-565.
8Vernon TM, Conner JS, Shaw BS, et ol. An evaluation of three techniques for improving immunization levels in elementary schools [J]. Am J Public Health, 1976, 66 (5): 457-460.
9Anthony N, Reed M, Left AM, et 01. Immunization: public health programming through law enforcement [J 1. Am J Public Health, 1977, 67 (8): 763-764.
10Middaugh JP, Zyla LD. Enforcement of school immunization law in Alaska [J]. JAMA, 1978, 239 (20): 2128-2130.
