Bellman, Richard, author
Addison-Wesley, 1968
Buku Teks
Perko, Lawrence
Springer-Verlag, 1991
Buku Teks
Lefschetz, Solomon
Dover , 1977
Buku Teks
Zill, Dennis G., author
Cengage Learning, 2018
Buku Teks
edited by M. Farkas
North-Holland, 1977
Buku Teks