Five best reference books for a home library

Donald Altschiller, a librarian at Boston University, named a five best list of "reference books [that] are essential for a home library" for the Wall Street Journal.One title on the list:Merck Manual of Medical InformationMerck, 2003 (second ed.)For more than a century, the drug-maker Merck & Co. has published a standard textbook for physicians known as the Merck Manual, but in 1997 the