Before revision: Second Law: Every person their book The second law of library science, "Every person their book," means that librarians are to serve a wide collection of patrons, acquire literature to fit a wide variety of needs, and refrain from prejudice or judging what specific patrons choose to read.
After revision: Second Law: Every person his or her book The second law of library science, "Every person their book," means that librarians are to serve a wide collection of patrons, acquire literature to fit a wide variety of needs, and refrain from prejudice or judging what specific patrons choose to read.