The ordered literature is taken from the librarian on duty and after using is returned to him. The reader may keep in the reading room a library document up to 7 calendar days from the day of the last using. Dictionaries, reference books, encyclopaedias, periodicals and other library documents from the collection of the reading room should not be taken away. If necessary, the reader leaves his personal card to carry the library document to the xerox. The readers have no right to take away for copying any literature from the building of the Central Library.