https://icodecloud.wordpress.com/2017/04/21/salesforce-sharing-visibility-designer-certification/

https://pradeep-dani.blogspot.com/2018/02/certified-sharing-and-visibility.html

https://www.justcerts.com/salesforce/sharing-and-visibility-designer-certification-exams.html

http://salesforcememo.com/2017/01/04/how-to-prepare-for-and-pass-sharing-and-visibility-designer-exam/