Amsterdam: North-Holland Publishing Company, 1980,
Buku Teks
Choquet, Gustave
Academic Press, 1966
Buku Teks SO
Hocking, John G.
Addison-Wesley, 1962
Buku Teks SO
Mansfield, Maynard J.
Robert E. Krieger, 1972
Buku Teks SO
Patty, C. Wayne
PWS Publishing, 1993
Buku Teks SO