Reference Books

More than 36,000 entries. Concise, easy-to-understand definitions. More than 20,000 usage examples. Over 400 detailed line drawings, many revised. ...

The perfect dictionary for quick, on-the-go language reference. 40,000 entries. Clear, concise definitions. Pronunciations and variant spellings. B...

More than 22,500 words and concepts in Spanish and English. More than 8,000 highly detailed, full-color illustrations, organized by subject in spec...