Practical English Usage
Second Edition
Michael Swan
Oxford University Press

ISBNs
Paperback 0-19-431197-X
Hardback 0-19-431198-8
International Student Edition (only in certain countries) 0-19-442146-5

Intermediate and above

Practical English Usage is the classic grammar reference book for both teachers and students of English as a foreign language. It is organised alphabetically - as opposed to thematically - making it easier to use for problem solving.