1. Hjelmgren J, Berggren F, Andersson F. Health economic guidelines: similarities, differences and some implications. Value Health 2001 May-Jun; 4 (3): 225–50
2. Gold M, Siegel J, Russell L, et al. Cost-effectiveness in health and medicine. Oxford: Oxford University Press, 1996
3. Drummond MF, Sculpher MJ, Torrance GW, et al. Methods for the economic evaluation of health care programmes. 3rd ed. Oxford: Oxford University Press, 2005
4. Brouwer WB, Koopmanschap MA, Rutten FF. Productivity costs in cost-effectiveness analysis: numerator or denominator. A further discussion. Health Econ 1997 Sep-Oct; 6 (5): 511–4
5. Tranmer JE, Guerriere DN, Ungar WJ, et al. Valuing patient and caregiver time: a review of the literature. Pharmacoeconomics 2005; 23 (5): 449–59