"Your book" in Spanish is "su libro". It is pronounced "sue LEE-bro". Please see this site for confirmation: http://www.answers.com/library/Translations
la mochila is how you say book bag in spanish
Libro de texto(Literally "book of text")
you say it `este libro'.
libro
"on the book" "en el Libro"
El Libro= The book Libros= Books
nuestro libro
cuaderno
Un librito.
libro encuadernado
libro bueno.
'"The Book" in Spanish is "el libro". "The book is black" would be "El libro es negro".