How to cast, if type has spaces in the name

How do I specify a cast, if the type name has spaces?  foo::integer is
easy,
but foo::'timestamp without time zone' is more murky.

In my case I have a table, and a view.  For no apparent reason the table
has
timestamp without time zone, but I need timestamp with time zone.
I'm using "select column at time zone 'PST8PDT'" to solve this problem.
But wonder
about the general case of typecasting when the type name is not a single
symbol.