Fuller, Graham E.
Westeriew Press, 1991
Buku Teks
Graham, Robert
St. Martin's Press, 1979
Buku Teks
Flint, Colin, author
Routledge, Taylor & Francis Group, 2017
Buku Teks
O`Tuathail, Gearoid
Routledge, 1996
Buku Teks
edited by Geatoid O`Tuathail and Simon Dalby
Routledge, 1998
Buku Teks