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Patricia Briggs did almost exactly this in her Mercy Thompson novel Frost Burned. The series overall (this is book 8) is told in the first person from Mercy's POV, but in two chapters Briggs shifts...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/23874 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/23874 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Patricia Briggs did almost exactly this in her Mercy Thompson novel [_Frost Burned_.](http://rads.stackoverflow.com/amzn/click/044102002X) The series overall (this is book 8) is told in the first person from Mercy's POV, but in two chapters Briggs shifts into third person, and the story is told from the perspective of the main character's husband. She labels those two chapters "Adam." It's just those two chapters. I would not write entire chapters in italics; it's visually exhausting. It's okay for sections, and I understand why you're doing it, but not for more than a page or two. If you segue into this other character's POV for _one_ chapter, I'd call it "Interlude: John" (whatever the non-main character's name is) and write it from limited omniscient third. That way we get all of John's thoughts and feelings, but it's clearly not your main character, and the style is different enough that there's no confusion.