The British Library catalogue of additions to the manuscripts, the G.K. Chesterton papers :
additional manuscripts 73186 - 73484.
APA Citation
British Library. (2001). The British Library catalogue of additions to the manuscripts, the G.K. Chesterton papers: additional manuscripts 73186 - 73484. London: British Library.
MLA Citation
British Library. The British Library Catalogue of Additions to the Manuscripts, the G.K. Chesterton Papers: Additional Manuscripts 73186 - 73484. London: British Library, 2001.
Warning: These citations may not always be complete (especially for serials).