SWARUP R. (1992). AN INTRODUCTION TO MAN & HIS ENVIRONMENT. MITTAL PUBLICATIONS.
Chicago-referens (17:e uppl.)SWARUP R. AN INTRODUCTION TO MAN & HIS ENVIRONMENT. NEW DELHI: MITTAL PUBLICATIONS, 1992.
MLA-referens (9:e uppl.)SWARUP R. AN INTRODUCTION TO MAN & HIS ENVIRONMENT. MITTAL PUBLICATIONS, 1992.
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