Generally, the category of works we call "reference" includes almanacs, bibliographies, dictionaries, directories, encyclopedias, guidebooks, handbooks, indexes, manuals, yearbooks—materials we "refer" to rather than read entirely. Go to these for definitions, formulas, codes, standards, and topic overviews or background information.
Books about international business, international management, business law, small businesses, and related topics are not all together in one area, but may be found in several different call number areas--mainly the HD, HF, and KF sections of the library shelving area (the stacks).
The Library of Congress Classification call number chart below shows where you might browse in the stacks to find books related to your courses.
When searching for a book on a particular topic, you may find it more efficient to go to the library web search to find exact call numbers for specific titles you want to use. Remember that you can ask a reference librarian to assist you with your research, in person in the library, by telephone or online.