Knoll, Robert E.
Contrasts
Harcourt, Brace and Company, 1959
 Buku Teks
Stewart, Rosemary
Contrasts in management a study of different types of managers' job: their demands and choices
McGraw-Hill, 1976
 Buku Teks
Stewart, Rosemary
Contrasts in management
McGraw-Hill, 1976
 Buku Teks
Investment opportunities study petrochemicals in Thailand /
Brocker Group Ltd., 1995
 Buku Teks
Nilsen, Don L. F.
Pronunciation contrasts in English
Regents Publishing, 1973
 Buku Teks