'Based on "A Grammar of contemporary English" by Randolph Quirk, Sidney Greenbaum, Geoffrey Leech, Jan Svartvik [Harlow : Longman, 1972]'.
Bibliography: p.462-464. _ Includes index.
A university grammar of English ... by Randolph Quirk. ISBN 0582552079. Published by Longman in 1973. Publication and catalogue information, links to buy online and reader comments.