3 providers for more bandwith

I have 3 internet providers I have 3 dhcp clients created can I bring together these 3 providers for more bandwidth?
If yes how do I configure this?
Thanks in advanced

Without something like BGP or you have control of both ends you will not be able to bond them for a combined throughput. You can load balance though.

http://wiki.mikrotik.com/wiki/Manual:PCC

i will use bgp how must i do the config?
Thanks for quick reply