OKLAHOMA CITY (AP) — Oklahoma liquor retailers are challenging sweeping voter-approved guidelines that expand wine and strong beer sales to grocery and convenience stores but remain puzzled about how their businesses will fit into the new regulatory landscape if their legal challenge is unsuccessful.

State law currently allows wine and strong beer to be sold only at licensed package liquor stores. But the law approved in November would allow grocery and convenience stores to also sell those products starting on Oct. 1, 2018.

"The little liquor store down the street is now going to have to comp...