The parenthetical expressions would really not be needed to supplement the emphatic words.
"The Art of Public Speaking" by Dale Carnagey (AKA Dale Carnegie) and J. Berg Esenwein
To separate parenthetical or intermediate expressions from the context.
"Punctuation" by Frederick W. Hamilton
Parenthetical expressions, also for the same reason, are read in lower pitch.
"The Ontario High School Reader" by A.E. Marty