McCutchan, P. (1978). Blackmail north: A 'Simon Shard' novel. Hodder and Stoughton.
Lua i Stíl Chicago (17ú heag.)McCutchan, Philip. Blackmail North: A 'Simon Shard' Novel. London: Hodder and Stoughton, 1978.
Lua MLA (8ú heag.)McCutchan, Philip. Blackmail North: A 'Simon Shard' Novel. Hodder and Stoughton, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.