Milton-Edwards, Beverly
Routledge, 2014
Buku Teks SO
edited by Terry Gourvish
Macmillan Education, 1991
Buku Teks SO
Thody, Philip
Routledge, 2000
Buku Teks
Calvocoressi, Peter
Longman, 1991
Buku Teks SO
edited with an introduction by Richard M. Dalfiume
Quadrangle Books, 1969
Buku Teks SO