APA

British Pain Society and British Geriatrics Society, . (2007). Guidance on the assessment of pain in older people. London: British Pain Society and British Geriatrics Society.

Chicago

British Pain Society and British Geriatrics Society, . 2007. Guidance on the assessment of pain in older people. London: British Pain Society and British Geriatrics Society.

Harvard

British Pain Society and British Geriatrics Society, . (2007). Guidance on the assessment of pain in older people. London: British Pain Society and British Geriatrics Society.

MLA

British Pain Society and British Geriatrics Society, . Guidance on the assessment of pain in older people. London: British Pain Society and British Geriatrics Society. 2007.