The format is {{s-ref|reference}}, where reference is replaced by a reference or note in proper citation form. Subsequent references can be used in respective parameters: {{s-ref|reference1|reference2}}. This template should be used with all succession boxes as a citation tool and with a confusing succession boxes as a note tool. It currently allows up to 10 references although that can be increased if requested.

Note: This template has {{s-end}} embedded into it, therefore succession boxes using this template should not be closed with a separate {{s-end}}.

From the Henry VII of England article:

{{s-start}}
{{s-reg | en}}
{{s-bef | before = [[George Plantagenet, 1st Duke of Clarence|George of Clarence]]}}
{{s-ttl | title = [[Earl of Richmond]] | years = 1478–1485}}
{{s-non | reason = Merged in the Crown}}
{{s-ref | Pas, Leo van de, http://www.genealogics.org }}

Documentation for creating succession boxes can be found at Template:S-start.