Bear, Carolyn. Psid And Bolter - Oxford : Oxford University Press, 2007. - 64 p. : ill., 1 port. ; 21 cm. - Oxford reading tree. All stars . - Oxford reading tree. All stars . ISBN: 9780199152063 (pbk.) : No price Nat. Bib. No.: GBA796423 bnb Nat. Bib. Agency Control No.: 013776472 Uk Dewey Class. No.: 823.914