public boolean checkBookValues(String isbn, String title, String author){
        boolean resultCheck = false;
        if(isbn.length() <= Model.getInstance().getBookIsbnSize() &&
                title.length() <= Model.getInstance().getBookTitleSize() &&
                author.length() <= Model.getInstance().getBookAuthorSize() && !(isbn.isEmpty()) ){
            resultCheck = true;
        }
        else if(!(isbn.length() <= Model.getInstance().getBookIsbnSize()) || isbn.isEmpty()){
            View.getInstance().printMessage(8);
        }
        else if(!(title.length() <= Model.getInstance().getBookTitleSize())){
            View.getInstance().printErrorText(11);
        }
        else {View.getInstance().printErrorText(12);}
        if(LOGGER.isLoggable(Level.FINE)){
            LOGGER.log(Level.FINE, "The result of check book values is: ", resultCheck);}
        return resultCheck;
    }