An introduction to Kafka’s The Metamorphosis by Prof Ritchie Robertson, Taylor Professor of German Language and Literature, University of Oxford.
http://de.wikipedia.org/wiki/Die_Verwandlung
Tim Rogers and Margaret Czepiel: Catalogue of the papers of Franz Kafka, 1882-1940, Bodleian Library, University of Oxford, 2011 – http://www.bodley.ox.ac.uk/dept/scwmss/wmss/online/modern/kafka/kafka.html