MetroSource and Cook's Illustrated, are which type of publication?
Cook's Illustrated Cook's Illustrated is an American cooking magazine published every two months by the America's Test Kitchen company in Brookline, Massachusetts. It accepts no advertising and is characterized by extensive recipe testing and detailed instructions. The magazine also conducts thorough evaluations of kitchen equipment and branded foods and ingredients.
Cookbook A cookbook or cookery book is a kitchen reference publication containing a collection of recipes, typically organized by type of dish.