The paper will look white... that's ok. just use that to set your manual WB. Also, the fl. lighting or tungsten wb should make it look less yellow.
http://www.kenrockwell.com/tech/whitebalance.htm maybe this will help? or maybe not.. he just says to use the auto WB..hehe!
ETA: maybe this?
http://forums.dpreview.com/forums/post/11622756 sorry I don't have time to read it now..