Cita APA

ProQuest. (2004). ProQuest Science Journals. USA: Umi company.

Chicago Style Citation

ProQuest. ProQuest Science Journals. USA: Umi company, 2004.

Cita MLA

ProQuest. ProQuest Science Journals. USA: Umi company, 2004.

Atenció: Aquestes cites poden no estar 100% correctes.