The British Museum guide and map :
with descriptions of selected objects.

APA Citation

British Museum., British Museum. Trustees. (1972). The British Museum guide and map: with descriptions of selected objects. Rev. ed. [London]: Trustees of the British Museum.

MLA Citation

British Museum, and British Museum. Trustees. The British Museum Guide And Map: With Descriptions of Selected Objects. Rev. ed. [London]: Trustees of the British Museum, 1972.

Warning: These citations may not always be complete (especially for serials).