Walker, D., & Lui, N. (1969). Impact '68: A survey of United Kingdom examination questions related to world poverty and development topics. Education Unit.
Citazione stile Chigago Style (17a edizione)Walker, Derek, e Nance Lui. Impact '68: A Survey of United Kingdom Examination Questions Related to World Poverty and Development Topics. London: Education Unit, 1969.
Citatione MLA (9a ed.)Walker, Derek, e Nance Lui. Impact '68: A Survey of United Kingdom Examination Questions Related to World Poverty and Development Topics. Education Unit, 1969.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.