Who's Buying at Restaurants and Carry-Outs, 13th by "The 13th edition of Who’s Buying at Restaurants and Carry-Outs is based on unpublished data collected by the Bureau of Labor Statistics’ 2014 Consumer Expenditure Survey—you can’t get these data online. It examines how much Americans spend on eating out by the demographics that count: age, income, high-income households, household type, race and Hispanic origin, region of residence, and education."
Restaurant, Food & Beverage Market Research Handbook 2020-2021 by 
Restaurant Success by the Numbers, 2nd by 
How to Become a Rock Star Chef : 11 Steps to Dominate Your Market in the New Digital Economy by "Digital Marketing and Celebrity Chef Branding expert Mark Garcia shares hard-won advice and real life examples on how chefs, restaurateurs and food-service professionals can connect and engage with customers, so that they can dominate their competitive marketplace."
Hospitality Marketing Management by "This popular textbook explores marketing and themes unique to hospitality and tourism, with a focus on the practical applications of marketing rather than marketing theory. It provides readers with the tools they need to successfully execute marketing campaigns for a hospitality business, no matter what their specialty."