Não informado. (2009). Occasional Papers of the Challenger Society. Challenger Society.
Style de citation Chicago (17e éd.)Não informado. Occasional Papers of the Challenger Society. Oxford, Inglaterra: Challenger Society, 2009.
Style de citation MLA (8e éd.)Não informado. Occasional Papers of the Challenger Society. Challenger Society, 2009.
Attention : ces citations peuvent ne pas être correctes à 100%.