Someone asked for an 'authoritative' statement on the preference of sentence case in headings:
This is a sample of sentence case
as opposed to the use of title case:
This Is A Sample Of Title Case
As a UK typographer, the rule is sentence case, and has near enough been a given in typography. I wonder if anyone can point me in the direction of an authoritative source that a friend can use in an argument.
The argument is between US and UK style, I think.