Gilbert, Martin, author
Routledge, 1994
Buku Teks
Reves, Emery, author
Elsevier, 1947
Buku Teks
Kecskemeti, Paul, author
Stanford University Press, 1958
Buku Teks
Thomson, David
Kegan Paul, Trench, Trubner, 1945
Buku Teks
Jacob, Alaric, author
Collins, 1944
Buku Teks