Here are entered works on the reading interests of children or books recommended for children. Collections of literary works or individual literary works written by children under 15 years of age are entered under [Children's writings.] Works on child authors as a class of persons are entered under [Child authors.] Collections of works published for children, including literary works, nonliterary works, or both, are entered under [Children's literature.] Works on books for children considered as physical objects are entered under [Children's books.]