Steinberg, David J. (David Joel), author
Solidaridad Publishing House, 1967
Buku Teks
Young, Peter, author
Bison Books, 1985
Buku Referensi
edited by Brigadier Peter Young
Hamlyn, 1981
Buku Referensi
edited by Debbie Lewer
Blackwell, 2005
Buku Teks
Buku Teks