Não informado. (1976). Dissertation abstracts international. University Microfilms International.
Style de citation Chicago (17e éd.)Não informado. Dissertation Abstracts International. London: University Microfilms International, 1976.
Style de citation MLA (8e éd.)Não informado. Dissertation Abstracts International. University Microfilms International, 1976.
Attention : ces citations peuvent ne pas être correctes à 100%.