Some questions about ISO 27001

Q1) 'There is no policy or procedure in place listing the controls for documents of external origin.' 
So I need to work on the document control proc(or any doc which talks about doc mgmt.) and include topics on how to handle n manage the docs which are NOT prepared by my client.
I tried to list few documents of external origin:
Customer prints
Industry regulations
ISO Standards
References used for your documentation
Corporate guidance documents
Can you tell me what exactly is required when its said 'documents of external origin'?
 

Q2) How can I help the Management review to include 
(A) Changes in external & internal issues that are relevant to ISMS 
(B) Feedback on InfoSec performance on fulfillment of information security objectives as required by ISO 27001:2013) 
 

Q3) On clause 4.2, have tried discussing the same with Alan,..
@Alan : Please follow up on this one too
 

Answer:

Point 1: You are ok, furthermore can be external documents: reports of external auditors, project plans of your clients, and any document external to your organization (where the ISMS is implemented). Anyway, I suggest you that the control of external documents is almost the same as the control of internal documents. For more information, please read this article "Document management in ISO 27001 & BS 25999-2" : https://advisera.com/27001academy/blog/2010/03/30/document-management-within-iso-27001-bs-25999-2/
Point 2: (A) You need to request to any change to external/internal issues and you can develop a report with conclusions about this, (B) You can develop a report of conclusions of the risk assessment & treatment. Also these articles can be interesting for you:

Why is management review important for ISO 27001 and ISO 22301? : https://advisera.com/27001academy/blog/2014/03/03/why-is-management-review-important-for-iso-27001-and-iso-22301/
How to perform monitoring and measurement in ISO 27001: https://advisera.com/27001academy/blog/2015/06/08/how-to-perform-monitoring-and-measurement-in-iso-27001/
Point 3: Sorry but I do not understand this question. Can you reformulate it? Anyway, this article about interested parties  can be interesting for you “How to identify interested parties according to ISO 27001 and ISO 22301” : https://advisera.com/27001academy/knowledgebase/how-to-identify-interested-parties-according-to-iso-27001-and-iso-22301//