PLEASE CHECK THE PHOTOS. The Oxford 4 x books reference set slipcase includes a comprehensive collection of books by various authors, published by Oxford University Press in the United Kingdom. This hardcover set covers topics related to English language usage, quotations, and thesaurus, making it a valuable resource for scholars and language enthusiasts. Printed in 2001, this set provides a detailed reference for those seeking insights into the language and literature of the English-speaking world.