Cita APA

ProQuest. (1997). Dissertation abstracts [Đĩa CD-ROM]. USA: Umi company.

Chicago Style Citation

ProQuest. Dissertation Abstracts [Đĩa CD-ROM]. USA: Umi company, 1997.

Cita MLA

ProQuest. Dissertation Abstracts [Đĩa CD-ROM]. USA: Umi company, 1997.

Atenció: Aquestes cites poden no estar 100% correctes.