Oakland, John
Routledge , 1992
Buku Teks
Smellie, K.B.
Frederick A. Preager 1955 , 1955
Buku Teks
edited by Peter Childs, Mike Storry
Routledge, 1999
Buku Referensi
Sylvan Press, 1949
Buku Teks
Stout, Hiram Miller
Oxford University Press, 1953
Buku Teks