Humphreys, A. (1980). Daniel Defoe Robinson Crusoe. Longman Group.
Lua i Stíl Chicago (17ú heag.)Humphreys, A.R. Daniel Defoe Robinson Crusoe. Harlow: Longman Group, 1980.
Lua MLA (8ú heag.)Humphreys, A.R. Daniel Defoe Robinson Crusoe. Longman Group, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.