School Book Sellers
蓝牙手机斗地主A book is a set or collection of written, printed, illustrated, or blank sheets, made of paper, parchment, or other various material, usually fastened together to hinge at one side. A single sheet within a book is called a leaf, and each side of a leaf is called a page. A book produced in electronic format is known as an electronic book. Books may also refer to a literature work, or a main division of such a work. In library and information science, a book is called a monograph, to distinguish it from serial periodicals such as magazines, journals or newspapers. The body of all written works including books is literature. Students typically store and carry textbooks and schoolbooks for study purposes. Elementary school pupils often use workbooks, which are published with spaces or blanks to be filled by them for study or homework.