The principles adopted in the selection of articles have followed the general guidelines and selection principles applied in the procurement of theoretical literature. References to articles published in periodicals between 1984 and 1997 can thus still be found in SBI's card indexes.
BULB is thus a bibliography of both Swedish and foreign material, containing mainly new references.
SBI's aim, however, is to catalogue retroactively older books, contributions and articles. Articles published in Sweden and abroad on the history and theory of children's and young persons' literature. Authors and illustrators, both Swedish and foreign, who contribute to works for children and young people. Articles in periodicals and annuals - from the 1998 publication year onwards. Material published prior to this can be found to a limited extent.