Calendaring Extensions to WebDAV (CalDAV). - Cyrus Daboo; Bernard Desruisseaux; Laurie Dusseault (RFC, 2007)

Internet Calendaring and Scheduling Core Object Specification (iCalendar). - Bernard Desruisseaux (RFC, 2009)

Scheduling Extensions to CalDAV. - Cyrus Daboo; Bernard Desruisseaux (RFC, 2012)