APA aipamena

ProQuest. (1997). ProQuest serchware for windows: Version 5.1 [Đĩa CD-ROM]. USA: Umi company.

Chicago Style aipamena

ProQuest. ProQuest Serchware for Windows: Version 5.1 [Đĩa CD-ROM]. USA: Umi company, 1997.

MLA aipamena

ProQuest. ProQuest Serchware for Windows: Version 5.1 [Đĩa CD-ROM]. USA: Umi company, 1997.

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