Moot, Richard, editor
[, Springer-Verlag], 2012
eBooks
Leblanc, Hugues
Mass. Allyn and Bacon , 1974
Buku Teks
Zwarts, Joost
The Netherlands, 1992
Buku Teks
Gruber, Jeffrey S.
North-Holland , 1976
Buku Teks
Williams, Alexander, author
Cambridge University Press, 2015
eBooks