Burton, S. H. Mastering English language / S.H. Burton and J.A. Humphries. - 2nd ed. - Houndmills : Macmillan, 1992. - viii, 210 p. : ill. ; 24 cm. ISBN: 0333515064 (pbk.) LCCN: 93197479 LC Class. No.: PE1408 .H86 1992 / .B8845 1992 Dewey Class. No.: 428.2