Terry traveled to Celtic lands in 1997, visiting the northern area of County Clare and the western islands of Scotland, where he attended a 10-day training in Celtic Shamanism. He will bring his experiences and family history to the performance of these stories and songs.
It is unas libretas. Unas is femenine and plural indefinite article, and it match with libretas. You do not have more options @Crissy15 in this case. @Crissy15 if you say las libretas you are using the femenine and plural definite article las. if you say unas libretas you are using the femenine and plural indefinite article unas. Crissy15.
Parts of Speech. Chapter 9 - Articles. An article is a kind of adjective which is always used with and gives some information about a noun. There are only two articles a and the, but they are used very often and are important for using English accurately. The word a (which becomes an when the next word begins with a vowel - a, e, i, o, u) is called the indefinite article because the noun it goes with is indefinite or general.