Hi Franklyn,mostly work-Life Balance is measured by work-life conflict scales. You might have a look at the follwing papers:
Frone, Michael R., Marcia Russell, and M. Lynne Cooper. "Antecedents and outcomes of work-family conflict: testing a model of the work-family interface." Journal of applied psychology 77.1 (1992): 65.
Ernst Kossek, Ellen, and Cynthia Ozeki. "Work–family conflict, policies, and the job–life satisfaction relationship: A review and directions for organizational behavior–human resources research." Journal of applied psychology 83.2 (1998): 139.
Article Antecedents and Outcomes of Work-Family Conflict: Testing a ...