Google Review requirements

[Nick_Johansson]

I'm considering asking some of our clients to leave a Google review on places page. Currently we've focused more on LinkedIn recommendations but this has not impact on local search results. So my questions is what do our clients require to leave a Google review? Do they need a Google + profile? Do they need a Google + business page? Or would a personal gmail account suffice?

Appreciate any feedback you have!

[WhoWuddaThunk]

They just need a Gmail.