The Statistical Abstract of the United States is an excellent source for any statistics primarily related to the United States, published by GPO since 1878. Provides data from government sources related to population, health, education, income, labor, science, transportation, commerce and more.
Membership in a professional organization can be beneficial to your career goals. Student memberships are generally inexpensive and a good way to get started thinking like a pro.
"The purpose of the North American Society for Sport Management is to promote, stimulate, and encourage study, research, scholarly writing, and professional development in the area of sport management - both theoretical and applied aspects." (from the website)