Statistics show that many people who quit their jobs, did so because they wanted a raise— Instead of quitting, they could have considered timing their requests better. Here’s an article detailing the exact right time to ask for one
Source: 45% of people who quit their jobs wanted a raise—here’s the exact right time to ask for one
Alternatively you can have a look at the following books on how to go about asking for a pay rise.
[amazon_link asins=’B075JQNLH7,B077CTJSG7,B00BPG6NA4,B00A7DMBFC,B01NBI5PM2′ template=’ProductGrid’ store=’consumerintui-21′ marketplace=’UK’ link_id=’ec206caa-e429-11e8-b4f4-158573aa811a’]Timing is crucial.