[groff] In text references: optional page numbers?

[Paul Swanson]

Hello,

I'm sorry if this has been covered a thousand times before but I'm hoping 
someone can help me.

Using groff, refer and the ms macros, I can't figure out how to achieve in text 
references with optional page numbers.

Here's what I'd like to achieve.

Sometimes, I need to reference a given work in its entirety:

... and thus all is foo bar (Smith 1984).

Other times, I need to quote the same author / source directly:

... "and thus all is foo bar" (Smith 1984, p. 42).

I can't figure out how to create an in text reference that will behave like 
that.

I can achieve one or the other, but not both.

Please help.

Regards,

Paul Swanson

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