From libretto + -ino. <span class="searchmatch">librettino</span> m (plural librettini) booklet...
librettini m plural of <span class="searchmatch">librettino</span> librettini f plural of librettine...
libri, diminutive librétto or librìno or libriccìno (more common) or <span class="searchmatch">librettìno</span>, augmentative libróne, pejorative libràccio, derogatory libriciàttolo...