Lorna
Inkling
I've noticed that books written in the first person and third person omniscient don't use internal monologue. It only seems to be used in third person limited where the narrator shifts briefly from third to first person. I haven't noticed it used in anything I have read recently. Perhaps this is a signal it's bad practice / inconsistent to hop in and out of character's heads. I know that mixing internal monologue into my text has made it messy.
@ Benjamin
I noticed your comment about breaking the rules.
The last book I read, The Apple and the Thorn by Emma Restall-Orr and Walter William Menyck used italics for thoughts directed at other people for example 'I hear him whisper in my mind, Why do you let me hold you, Vivi?
Ultimately I think it depends on whether it works.
@ Benjamin
I noticed your comment about breaking the rules.
The last book I read, The Apple and the Thorn by Emma Restall-Orr and Walter William Menyck used italics for thoughts directed at other people for example 'I hear him whisper in my mind, Why do you let me hold you, Vivi?
Ultimately I think it depends on whether it works.