There are ten steps to undertaking a literature search.
I want to write a literature review, where do I start? - ANMJ
It provides guidance on writing a literature review, emphasizing the importance of determining the type of review you intend to undertake.
There are a number of professional UK and International bodies. The ones listed below are the ones that accredit some of the courses in the subject area.
Other academic libraries with relevant materials can be accessed via the SCONUL Access Scheme. Search Library Hub Discover to find out which libraries have useful material.