Garcia-Esteve L, Navarro P, Ascaso C, Aguado J, Torres A. Major depressive episode in postpartum: a preliminary prospective 1-year naturalistic follow-up. In: Colombus F, editors. New research on postpartum depression. New York: United States. Novs Science Publishers, Inc; 2007. p.85-104.
Thissen D, Nelson K, Rosa K, McLeod L. Item response theory for items scored in more than two categories. In: Thissen D, Wainer H, editors. Test scoring. Hillsdale: NJ. Lawrence Erlbaum Associates Publishers; 2001.
McLeod LD, Swygert KA, Thissen D. Factor analysis for items scored in two categories. In: Thissen D, Wainer H, editors. Test scoring. Hillsdale: NJ. Lawrence Erlbaum Associates Publishers; 2001.
Swygert KA, McLeod L, Thissen D. Factor analysis for items or testlets scored in more than two categories. In: Thissen D, Wainer H, editors. Test scoring. Hillsdale: NJ. Lawrence Erlbaum Associates Publishers; 2001.