Leabo, Dick A., author
Richard D. Irwin, 1968
Buku Teks SO
Lewis, John P., author
Addison-Wesley, 1999
Buku Teks
Besag, Frank P., author
Sage, 1985
Buku Teks
Rubin, Allen, author
Brooks/Cole Cengage Learning, 2013
Buku Teks
Levin, Richard I., author
Prentice-Hall, 1998
Buku Teks SO