Linguistics : an introduction to linguistic theory
Victoria A. Fromkin
Blackwell Publishers, 2001
 Buku Teks SO
Chambers, J.K.
Sociolinguistic theory : linguistic variation and its social significance
Wiley-Blackwell, 2009
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Introduction to the theory and practice of econometrics
by George G. Judge ... [and others]
John Wiley & Sons, 1988
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Introduction to the theory and practice of econometrics
by George G. Judge ... [and others]
John Wiley & Sons, 1982
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Andersen, Kenneth E.
Introduction to communication theory and practice
Cummings Publishing, 1972
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