Abstract: A printed matter has a plurality of texts and/or graphs and at least one identification code printed on a stationary medium. The identification code is used for identifying reference information of the texts and/or graphs. The printed matter further has a storage medium, an input device, a processor and an output device. The reference information is stored in the storage medium. The input device is operative to detect the identification code. The processor is in electric communication with the storage medium and the input device to retrieve the reference information when the input device detects the identification code. The output device is in electric communication with the processor and controlled by the processor to output the reference information.