Format: in text citation
GraphicsDrawer source code is an example of … (Author, Year).
Format: reference
Author/Developer (Year) Title of program (Version if applicable). [source code]. Available from: URL [Accessed date].
Example: in text citation
GraphicsDrawer source code is an example of … (Smith, 2019).
Example: reference
Smith, J. (2019) GraphicsDrawer (Version 2.0). [source code]. Available from: http://www.graphicsdrawer.com [Accessed 13th January 2020].