edited by Bella Gyires
North-Holland, 1980
Buku Teks
Laha, R.G., author
John Wiley & Sons, 1979
Buku Teks
Kyburg, Henry E., author
Prentice-Hall, 1969
Buku Teks
Loeve, Michel, author
D. van Nonstrand, 19763
Buku Teks
Krickeberg, Klaus, author
Addison-Wesley, 1965
Buku Teks