Perrin, P. G. (1942). Writer's guide and index to English. Scott, Foresman and company.
Chicago Style (17. basım) AtıfPerrin, Porter Gale. Writer's Guide and Index to English. Chicago, Atlanta [etc.]: Scott, Foresman and company, 1942.
MLA (8th ed.) AtıfPerrin, Porter Gale. Writer's Guide and Index to English. Scott, Foresman and company, 1942.
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