Gale Group, Gale Research Company, & Thomson Gale (Firm). (1989). Government research directory (5th ed.). Gale Research Co.
Chicago Style (17. basım) AtıfGale Group, Gale Research Company, ve Thomson Gale (Firm). Government Research Directory. 5th ed. Detroit, Mich: Gale Research Co, 1989.
MLA (9th ed.) AtıfGale Group, et al. Government Research Directory. 5th ed. Gale Research Co, 1989.
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