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Kaambwa, Billingsley, Liz Gill, Nicola McCaffrey, Emily Lancsar, Ian D. Cameron, Maria Crotty, Len Gray, e Julie Ratcliffe. "An Empirical Comparison of the OPQoL-Brief, EQ-5D-3 L and ASCOT in a Community Dwelling Population of Older People." Health Qual Life Outcomes 2015.

Kaambwa, Billingsley, et al. "An Empirical Comparison of the OPQoL-Brief, EQ-5D-3 L and ASCOT in a Community Dwelling Population of Older People." Health Qual Life Outcomes 2015.