APA aipamena

Verschuren, P. (1999). Designing a research project. Utrecht: Lemma BV.

Chicago Style aipamena

Verschuren, Piet. Designing a Research Project. Utrecht: Lemma BV, 1999.

MLA aipamena

Verschuren, Piet. Designing a Research Project. Utrecht: Lemma BV, 1999.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.