Não informado. (1950). British National Bibliography. British Library, Bibliographic Services Division.
Cita Chicago Style (17a ed.)Não informado. British National Bibliography. London: British Library, Bibliographic Services Division, 1950.
Cita MLA (8a ed.)Não informado. British National Bibliography. British Library, Bibliographic Services Division, 1950.
Precaución: Estas citas no son 100% exactas.