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I would suggest looking for professional editors associations in your country. Here in Canada, for example, we have the Editors Association of Canada. Such associations will likely have referral se...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/24300 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I would suggest looking for professional editors associations in your country. Here in Canada, for example, we have the Editors Association of Canada. Such associations will likely have referral services and perhaps certification programs. Membership in a professional society is usually a plus in evaluating any service provider. (Not sufficient in itself, but a good sign.) Most associations have code of conduct and practice. Some require proof of experience and/or competence to join or to achieve full membership. And there mere fact that the person is willing to pay their dues says that they are somewhat serious about what they are doing.