Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
yourself [jɔːˈsɛlf] pron (reflexive) себя́; (after prep, +gen) себя́; (:+dat, +prp) себе́; (:+instr) собо́й; (emphatic) сам (f сама́); (pl са́ми); (alone)
(all) by yourself оди́н
you yourself told me Вы са́ми говори́ли мнеsee also myself
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.