Explanation:

Business analysts cite two primary sources of business information: external information, in which documentation is made available to the public from a third party; and internal information, which consists of data created for the sole use of the company that produces it, such as personnel files, trade secrets, and minutes of board meetings.
External information comes in a variety of forms--from printed material to broadcast reports to online dissemination.
The category of print covers not only a vast array of books and periodicals, but also includes microfilm and microfiche, newsletters, and other subcategories. State and federal government reports also fit into this category; indeed, Lavin described the U.S. Government Printing Office as "the largest publisher in the free world; its products can be purchased by mail, telephone or through GPO bookstores in major cities."