Clarke, E. (1979). Objective and completion tests in O Level history: British social and economic history 1700 - 1970. Murray.
Citazione stile Chigago Style (17a edizione)Clarke, Ernest. Objective and Completion Tests in O Level History: British Social and Economic History 1700 - 1970. London: Murray, 1979.
Citatione MLA (9a ed.)Clarke, Ernest. Objective and Completion Tests in O Level History: British Social and Economic History 1700 - 1970. Murray, 1979.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.