I believe the datasheet says 68 ohms for 1mA.I already told you to look in the LM334 datasheet, Page 9, "Basic Current Source". It gives you an application note for using one; it is incredibly simple. I told you Rset as well, which is 1.2kOhm for 1mA current.
Here is the datasheet: http://www.national.com/profile/snip.cgi/openDS=LM334