Allen, R.G.D., author
Macmillan, 1973
Buku Teks
Dowling, Edward Thomas, author
McGraw-Hill, 1992
Buku Teks
Moran, Siegfried, author
North-Holland, 1983
Buku Teks
Albert, Lillie R., author
Springer Science, 2012
eBooks
Dineen, Sean, author
American Mathematical society, 2005
Buku Teks