Edwards TP, Suresh R, Weeks M. Automated call scheduling: current systems and practices. In: Couper MP, Baker RP, Bethlehem J, Clark CZ, Martin J, Nicholls WL, O'Reilly JM, editors. Computer assisted survey information collection. New York: NY. John Wiley & Sons; 1998. p.283-306.
Rothman KJ, Greenland S. Hill's criteria for causality. In: Armitage P, Colton T, editors. The encyclopedia of biostatistics. Chichester: United Kingdom. John Wiley & Sons; 1998. p.1920-4.
Rothman KJ, Greenland S. Validity and generalizability in epidemiologic studies. In: Armitage P, Colton T, editors. The encyclopedia of biostatistics. Chichester: United Kingdom. John Wiley & Sons; 1998.