Harvard University. Laboratory for Computer Graphics and Spatial Analysis. SYMPAP user's reference manual. The Laboratory.
Chicago-referens (17:e uppl.)Harvard University. Laboratory for Computer Graphics and Spatial Analysis. SYMPAP User's Reference Manual. [s.l.]: The Laboratory.
MLA-referens (9:e uppl.)Harvard University. Laboratory for Computer Graphics and Spatial Analysis. SYMPAP User's Reference Manual. The Laboratory.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.