Maguire, Keith, author
Chambers, 1991
Buku Teks
Halpern, Manfred, author
Princeton University Press, 1963
Buku Teks
edited by David E. Long and Bernard Reich
Westview Press, 1986
Buku Teks
Deegan, Heather, author
Routledge, 1996
Buku Teks
edited by David E. Long and Bernard Reich
Westview Press, 2002
Buku Teks