Gaya APA

BLACKBURN, J, D. (1991). THE LEGAL ENVIRONTMENT OF BUSINESS FOURTH EDITION . U.S.A: RICHARD D.IRWIN, INC..

Gaya MLA

BLACKBURN, JOHN, D.. "THE LEGAL ENVIRONTMENT OF BUSINESS FOURTH EDITION". U.S.A: RICHARD D.IRWIN, INC., 1991. Text.