Using the Internet to communicate should be nothing new to pet specialty retailers; promoting your business over the web is absolute must in the 21st century. (petbusiness.com)
I put it up there with «On Writing» and «The Elements of Style» as absolute must reads. (audible.com)
Although not absolute must - haves, these five things will make your life easier, and perhaps even grant you some peace of mind. (fitpregnancy.com)