Linguistics books

1.
The Study of Language
George Yule, ~ Cambridge University Press 13 June, 1996 ~ ISBN: 052156851X
original edition in 1996
http://www.amazon.com/gp/product/052156851X/qid=1145463243/sr=2-1/ref=pd_bbs_b_2_1/103-1550251-9830237?s=books&v=glance&n=283155
new edition in 2005
http://www.amazon.com/gp/product/0521543207/qid=1145463243/sr=2-2/ref=pd_bbs_b_2_2/103-1550251-9830237?s=books&v=glance&n=283155

2.
Contemporary Linguistic Analysis: An Introduction
William D. O'Grady, William C'Grady, ~ Addison Wesley Publishing Company January, 2000 ~ ISBN: 0201478129
(http://www.amazon.com/gp/product/0201478129/ref=sr_11_1/103-1550251-9830237?%5Fencoding=UTF8)
3.
Language Files: Materials for an Introduction to Language & Linguistics (old)
Thomas W., Jr. Stewart, Nathan Vaillette, ~ Ohio State University Press July, 2001 ~ ISBN: 0814250769
Language Files: Materials for an Introduction to Language and Linguistics (new)
Georgios Tserdanelis, Wai Yi Peggy Wong, ~ Ohio State University Press April, 2004 ~ ISBN: 0814251285
4.
An Introduction to Language
Victoria Fromkin, Robert Rodman, Nina Hyams, ~ Heinle 02 August, 2002 ~ ISBN: 015508481X

please go to www.addall.com or www.amazon.com
you can see how the cover look like to see if you are in the right track.
Good luck!!

I have the book " An Introduciton to Language" , the authors are:
Victoria Fromkin
Robert Rodman
Nina Hyams

1. The study of language ==> George Yule
2. Contemporary linguistic analysis ==> William O'Grady and John Archibald.
3. Language file ==> The book's name is way too general. I can't be sure which one you are looking for. But, here are some options:
(1) New Windmill Language File: John Dayus, Tim Ayres (U.K.)
(2) The Language File: Fuller, Simon (Education Consultant, BBC) ~ Joyner, Jane (Head of English, Stoke Newington School, London) ~ Meaden, David (English Advisor, Hounslow) (U.K.)
4. Introduction to language ==> Victoria Fromkin
Robert Rodman – North Carolina State University
Nina Hyams - University of California, Los Angeles
Peter Collins - University of New South Wales
Mengistu Amberber - University of New South Wales