Source of title proper note (9.7B3; MARC 500)
Source of title note is combined with viewed on source and date.
Title from home page (ACM Digital Library, viewed on Oct. 15, 2008)
Title from HTML header (IEEE Xplore, viewed April 7, 2005)
Title from PDF title page (Publisher’s Web site, viewed on June 13, 2004)
Further guidance: OLAC CAPC online document "Source of Title Note for Internet Resources“ (3rd ed. 2005)