Analysis of information sources in references of the Wikipedia article "카메라 루시다" in Korean language version.
Wollaston, William H. 'An Instrument Whereby Any Person May Draw in Perspective, or May Copy of Reduce Any Print or Drawing.' British Patent no. 2993
Wollaston, William H. 'An Instrument Whereby Any Person May Draw in Perspective, or May Copy of Reduce Any Print or Drawing.' British Patent no. 2993