Libreti or Libretti: How To spell?
The word Libreti is misspelled against Libretti, which is plural of "Libretto"
Libretti has double "tt" is mispronounced as "t"Remember double 'TT' in between the strings libre & i which should not be misspelled with single 'T'
Wrong Spelling:  libre-t-i  Correct Spelling:  libre-tt-i 
Find more wrongly spelled words of Libretti to spell it well.