The series comes from the 'Current Employment Statistics (Establishment Survey)'
The source code is: CEU4245100001
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, All Employees: Retail Trade: Sporting Goods, Hobby, Book, and Music Stores [CEU4245100001], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/CEU4245100001/, August 3, 2015.